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Finding the Fourth Proportional to 702.53, 969.45 and 387.80

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Solution

The fourth proportional to 702.53, 969.45 and 387.80 is: 535.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.53 : 969.45 = 387.80 : x
  2. Step 2: Convert to fraction form
    702.53/969.45 = 387.80/x
  3. Step 3: Cross multiply
    702.53x = 969.45 × 387.80
  4. Step 4: Simplify right side
    702.53x = 375,952.71
  5. Step 5: Solve for x
    x = 375,952.71/702.53
  6. Step 6: Final answer
    x = 535.14

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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.