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Finding the Fourth Proportional to 1,013.54, 1,397.40 and 681.44

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Solution

The fourth proportional to 1,013.54, 1,397.40 and 681.44 is: 939.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.54 : 1,397.40 = 681.44 : x
  2. Step 2: Convert to fraction form
    1,013.54/1,397.40 = 681.44/x
  3. Step 3: Cross multiply
    1,013.54x = 1,397.40 × 681.44
  4. Step 4: Simplify right side
    1,013.54x = 952,244.26
  5. Step 5: Solve for x
    x = 952,244.26/1,013.54
  6. Step 6: Final answer
    x = 939.52

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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.