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Finding the Fourth Proportional to 208,432.97, 287,736.68 and 139,640.88

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Solution

The fourth proportional to 208,432.97, 287,736.68 and 139,640.88 is: 192,770.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,432.97 : 287,736.68 = 139,640.88 : x
  2. Step 2: Convert to fraction form
    208,432.97/287,736.68 = 139,640.88/x
  3. Step 3: Cross multiply
    208,432.97x = 287,736.68 × 139,640.88
  4. Step 4: Simplify right side
    208,432.97x = 40,179,802,505.27
  5. Step 5: Solve for x
    x = 40,179,802,505.27/208,432.97
  6. Step 6: Final answer
    x = 192,770.86

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1.5x scale

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.