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Finding the Fourth Proportional to 1,240.54, 1,711.92 and 681.02

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Solution

The fourth proportional to 1,240.54, 1,711.92 and 681.02 is: 939.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.54 : 1,711.92 = 681.02 : x
  2. Step 2: Convert to fraction form
    1,240.54/1,711.92 = 681.02/x
  3. Step 3: Cross multiply
    1,240.54x = 1,711.92 × 681.02
  4. Step 4: Simplify right side
    1,240.54x = 1,165,851.76
  5. Step 5: Solve for x
    x = 1,165,851.76/1,240.54
  6. Step 6: Final answer
    x = 939.79

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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.