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Finding the Fourth Proportional to 702.68, 1,053.35 and 642.53

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Solution

The fourth proportional to 702.68, 1,053.35 and 642.53 is: 963.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.68 : 1,053.35 = 642.53 : x
  2. Step 2: Convert to fraction form
    702.68/1,053.35 = 642.53/x
  3. Step 3: Cross multiply
    702.68x = 1,053.35 × 642.53
  4. Step 4: Simplify right side
    702.68x = 676,805.76
  5. Step 5: Solve for x
    x = 676,805.76/702.68
  6. Step 6: Final answer
    x = 963.18

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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.