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Finding the Fourth Proportional to 18,712.80, 28,090.80 and 11,325.60

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Solution

The fourth proportional to 18,712.80, 28,090.80 and 11,325.60 is: 17,001.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.80 : 28,090.80 = 11,325.60 : x
  2. Step 2: Convert to fraction form
    18,712.80/28,090.80 = 11,325.60/x
  3. Step 3: Cross multiply
    18,712.80x = 28,090.80 × 11,325.60
  4. Step 4: Simplify right side
    18,712.80x = 318,145,164.48
  5. Step 5: Solve for x
    x = 318,145,164.48/18,712.80
  6. Step 6: Final answer
    x = 17,001.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.