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Finding the Fourth Proportional to 18,638.19, 25,712.22 and 11,080.23

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Solution

The fourth proportional to 18,638.19, 25,712.22 and 11,080.23 is: 15,285.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,638.19 : 25,712.22 = 11,080.23 : x
  2. Step 2: Convert to fraction form
    18,638.19/25,712.22 = 11,080.23/x
  3. Step 3: Cross multiply
    18,638.19x = 25,712.22 × 11,080.23
  4. Step 4: Simplify right side
    18,638.19x = 284,897,401.17
  5. Step 5: Solve for x
    x = 284,897,401.17/18,638.19
  6. Step 6: Final answer
    x = 15,285.68

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Half scale
Find fourth proportional to 37,276.38, 51,424.45 and 22,160.46
Double scale
Find fourth proportional to 18,639.19, 25,713.60 and 11,081.23
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.