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Finding the Fourth Proportional to 428,397.15, 591,251.20 and 247,073.90

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Solution

The fourth proportional to 428,397.15, 591,251.20 and 247,073.90 is: 340,998.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,397.15 : 591,251.20 = 247,073.90 : x
  2. Step 2: Convert to fraction form
    428,397.15/591,251.20 = 247,073.90/x
  3. Step 3: Cross multiply
    428,397.15x = 591,251.20 × 247,073.90
  4. Step 4: Simplify right side
    428,397.15x = 146,082,736,289.74
  5. Step 5: Solve for x
    x = 146,082,736,289.74/428,397.15
  6. Step 6: Final answer
    x = 340,998.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.