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Finding the Fourth Proportional to 702.61, 969.55 and 387.85

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Solution

The fourth proportional to 702.61, 969.55 and 387.85 is: 535.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.61 : 969.55 = 387.85 : x
  2. Step 2: Convert to fraction form
    702.61/969.55 = 387.85/x
  3. Step 3: Cross multiply
    702.61x = 969.55 × 387.85
  4. Step 4: Simplify right side
    702.61x = 376,039.97
  5. Step 5: Solve for x
    x = 376,039.97/702.61
  6. Step 6: Final answer
    x = 535.20

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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.