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Finding the Fourth Proportional to 72,904.38, 99,951.90 and 71,575.78

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Solution

The fourth proportional to 72,904.38, 99,951.90 and 71,575.78 is: 98,130.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,904.38 : 99,951.90 = 71,575.78 : x
  2. Step 2: Convert to fraction form
    72,904.38/99,951.90 = 71,575.78/x
  3. Step 3: Cross multiply
    72,904.38x = 99,951.90 × 71,575.78
  4. Step 4: Simplify right side
    72,904.38x = 7,154,135,204.98
  5. Step 5: Solve for x
    x = 7,154,135,204.98/72,904.38
  6. Step 6: Final answer
    x = 98,130.39

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.