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Finding the Fourth Proportional to 393,909.08, 543,592.38 and 215,059.80

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Solution

The fourth proportional to 393,909.08, 543,592.38 and 215,059.80 is: 296,781.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,909.08 : 543,592.38 = 215,059.80 : x
  2. Step 2: Convert to fraction form
    393,909.08/543,592.38 = 215,059.80/x
  3. Step 3: Cross multiply
    393,909.08x = 543,592.38 × 215,059.80
  4. Step 4: Simplify right side
    393,909.08x = 116,904,868,524.32
  5. Step 5: Solve for x
    x = 116,904,868,524.32/393,909.08
  6. Step 6: Final answer
    x = 296,781.35

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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.