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Finding the Fourth Proportional to 72,695,277.20, 109,102,402.20 and 72,128,406.80

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Solution

The fourth proportional to 72,695,277.20, 109,102,402.20 and 72,128,406.80 is: 108,251,632.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,695,277.20 : 109,102,402.20 = 72,128,406.80 : x
  2. Step 2: Convert to fraction form
    72,695,277.20/109,102,402.20 = 72,128,406.80/x
  3. Step 3: Cross multiply
    72,695,277.20x = 109,102,402.20 × 72,128,406.80
  4. Step 4: Simplify right side
    72,695,277.20x = 7,869,382,448,738,815
  5. Step 5: Solve for x
    x = 7,869,382,448,738,815/72,695,277.20
  6. Step 6: Final answer
    x = 108,251,632.73

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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.