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Finding the Fourth Proportional to 81,121.40, 121,688.40 and 28,542.68

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Solution

The fourth proportional to 81,121.40, 121,688.40 and 28,542.68 is: 42,816.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,121.40 : 121,688.40 = 28,542.68 : x
  2. Step 2: Convert to fraction form
    81,121.40/121,688.40 = 28,542.68/x
  3. Step 3: Cross multiply
    81,121.40x = 121,688.40 × 28,542.68
  4. Step 4: Simplify right side
    81,121.40x = 3,473,313,060.91
  5. Step 5: Solve for x
    x = 3,473,313,060.91/81,121.40
  6. Step 6: Final answer
    x = 42,816.24

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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.