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Finding the Fourth Proportional to 131,691.66, 197,151.93 and 81,620.70

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Solution

The fourth proportional to 131,691.66, 197,151.93 and 81,620.70 is: 122,192.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,691.66 : 197,151.93 = 81,620.70 : x
  2. Step 2: Convert to fraction form
    131,691.66/197,151.93 = 81,620.70/x
  3. Step 3: Cross multiply
    131,691.66x = 197,151.93 × 81,620.70
  4. Step 4: Simplify right side
    131,691.66x = 16,091,678,532.95
  5. Step 5: Solve for x
    x = 16,091,678,532.95/131,691.66
  6. Step 6: Final answer
    x = 122,192.09

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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.