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Finding the Fourth Proportional to 398,393.89, 597,707.65 and 128,516.62

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Solution

The fourth proportional to 398,393.89, 597,707.65 and 128,516.62 is: 192,812.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,393.89 : 597,707.65 = 128,516.62 : x
  2. Step 2: Convert to fraction form
    398,393.89/597,707.65 = 128,516.62/x
  3. Step 3: Cross multiply
    398,393.89x = 597,707.65 × 128,516.62
  4. Step 4: Simplify right side
    398,393.89x = 76,815,366,926.14
  5. Step 5: Solve for x
    x = 76,815,366,926.14/398,393.89
  6. Step 6: Final answer
    x = 192,812.62

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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.