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Finding the Fourth Proportional to 128,687.70, 192,818.10 and 91,061.22

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Solution

The fourth proportional to 128,687.70, 192,818.10 and 91,061.22 is: 136,440.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,687.70 : 192,818.10 = 91,061.22 : x
  2. Step 2: Convert to fraction form
    128,687.70/192,818.10 = 91,061.22/x
  3. Step 3: Cross multiply
    128,687.70x = 192,818.10 × 91,061.22
  4. Step 4: Simplify right side
    128,687.70x = 17,558,251,424.08
  5. Step 5: Solve for x
    x = 17,558,251,424.08/128,687.70
  6. Step 6: Final answer
    x = 136,440.79

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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.