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Finding the Fourth Proportional to 72,700.38, 109,042.11 and 20,113.95

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Solution

The fourth proportional to 72,700.38, 109,042.11 and 20,113.95 is: 30,168.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,700.38 : 109,042.11 = 20,113.95 : x
  2. Step 2: Convert to fraction form
    72,700.38/109,042.11 = 20,113.95/x
  3. Step 3: Cross multiply
    72,700.38x = 109,042.11 × 20,113.95
  4. Step 4: Simplify right side
    72,700.38x = 2,193,267,548.43
  5. Step 5: Solve for x
    x = 2,193,267,548.43/72,700.38
  6. Step 6: Final answer
    x = 30,168.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.