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Finding the Fourth Proportional to 713.52, 987.12 and 626.40

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Solution

The fourth proportional to 713.52, 987.12 and 626.40 is: 866.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.52 : 987.12 = 626.40 : x
  2. Step 2: Convert to fraction form
    713.52/987.12 = 626.40/x
  3. Step 3: Cross multiply
    713.52x = 987.12 × 626.40
  4. Step 4: Simplify right side
    713.52x = 618,331.97
  5. Step 5: Solve for x
    x = 618,331.97/713.52
  6. Step 6: Final answer
    x = 866.59

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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.