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Finding the Fourth Proportional to 394,717.65, 592,082.01 and 128,479.56

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Solution

The fourth proportional to 394,717.65, 592,082.01 and 128,479.56 is: 192,721.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,717.65 : 592,082.01 = 128,479.56 : x
  2. Step 2: Convert to fraction form
    394,717.65/592,082.01 = 128,479.56/x
  3. Step 3: Cross multiply
    394,717.65x = 592,082.01 × 128,479.56
  4. Step 4: Simplify right side
    394,717.65x = 76,070,436,128.72
  5. Step 5: Solve for x
    x = 76,070,436,128.72/394,717.65
  6. Step 6: Final answer
    x = 192,721.14

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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.