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Finding the Fourth Proportional to 702.47, 969.41 and 391.97

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Solution

The fourth proportional to 702.47, 969.41 and 391.97 is: 540.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.47 : 969.41 = 391.97 : x
  2. Step 2: Convert to fraction form
    702.47/969.41 = 391.97/x
  3. Step 3: Cross multiply
    702.47x = 969.41 × 391.97
  4. Step 4: Simplify right side
    702.47x = 379,977.20
  5. Step 5: Solve for x
    x = 379,977.20/702.47
  6. Step 6: Final answer
    x = 540.92

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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.