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Finding the Fourth Proportional to 18,840, 26,001.60 and 11,388

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Solution

The fourth proportional to 18,840, 26,001.60 and 11,388 is: 15,716.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,840 : 26,001.60 = 11,388 : x
  2. Step 2: Convert to fraction form
    18,840/26,001.60 = 11,388/x
  3. Step 3: Cross multiply
    18,840x = 26,001.60 × 11,388
  4. Step 4: Simplify right side
    18,840x = 296,106,220.80
  5. Step 5: Solve for x
    x = 296,106,220.80/18,840
  6. Step 6: Final answer
    x = 15,716.89

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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.