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Finding the Fourth Proportional to 398,399.24, 597,715.64 and 128,521.96

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Solution

The fourth proportional to 398,399.24, 597,715.64 and 128,521.96 is: 192,820.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,399.24 : 597,715.64 = 128,521.96 : x
  2. Step 2: Convert to fraction form
    398,399.24/597,715.64 = 128,521.96/x
  3. Step 3: Cross multiply
    398,399.24x = 597,715.64 × 128,521.96
  4. Step 4: Simplify right side
    398,399.24x = 76,819,585,575.45
  5. Step 5: Solve for x
    x = 76,819,585,575.45/398,399.24
  6. Step 6: Final answer
    x = 192,820.61

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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.