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Finding the Fourth Proportional to 92,212.20, 138,231.90 and 72,210.60

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Solution

The fourth proportional to 92,212.20, 138,231.90 and 72,210.60 is: 108,248.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,212.20 : 138,231.90 = 72,210.60 : x
  2. Step 2: Convert to fraction form
    92,212.20/138,231.90 = 72,210.60/x
  3. Step 3: Cross multiply
    92,212.20x = 138,231.90 × 72,210.60
  4. Step 4: Simplify right side
    92,212.20x = 9,981,808,438.14
  5. Step 5: Solve for x
    x = 9,981,808,438.14/92,212.20
  6. Step 6: Final answer
    x = 108,248.24

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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.