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Finding the Fourth Proportional to 702.38, 969.30 and 399.53

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Solution

The fourth proportional to 702.38, 969.30 and 399.53 is: 551.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.38 : 969.30 = 399.53 : x
  2. Step 2: Convert to fraction form
    702.38/969.30 = 399.53/x
  3. Step 3: Cross multiply
    702.38x = 969.30 × 399.53
  4. Step 4: Simplify right side
    702.38x = 387,264.43
  5. Step 5: Solve for x
    x = 387,264.43/702.38
  6. Step 6: Final answer
    x = 551.36

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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.