Home / 428,960.27-643,424.22-129,432.86

Finding the Fourth Proportional to 428,960.27, 643,424.22 and 129,432.86

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Solution

The fourth proportional to 428,960.27, 643,424.22 and 129,432.86 is: 194,144.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,960.27 : 643,424.22 = 129,432.86 : x
  2. Step 2: Convert to fraction form
    428,960.27/643,424.22 = 129,432.86/x
  3. Step 3: Cross multiply
    428,960.27x = 643,424.22 × 129,432.86
  4. Step 4: Simplify right side
    428,960.27x = 83,280,233,770.75
  5. Step 5: Solve for x
    x = 83,280,233,770.75/428,960.27
  6. Step 6: Final answer
    x = 194,144.40

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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.