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Finding the Fourth Proportional to 121,957.65, 182,990.79 and 77,572.89

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Solution

The fourth proportional to 121,957.65, 182,990.79 and 77,572.89 is: 116,393.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,957.65 : 182,990.79 = 77,572.89 : x
  2. Step 2: Convert to fraction form
    121,957.65/182,990.79 = 77,572.89/x
  3. Step 3: Cross multiply
    121,957.65x = 182,990.79 × 77,572.89
  4. Step 4: Simplify right side
    121,957.65x = 14,195,124,423.68
  5. Step 5: Solve for x
    x = 14,195,124,423.68/121,957.65
  6. Step 6: Final answer
    x = 116,393.88

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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.