Home / 428,961.71-643,447.52-129,444.89

Finding the Fourth Proportional to 428,961.71, 643,447.52 and 129,444.89

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Solution

The fourth proportional to 428,961.71, 643,447.52 and 129,444.89 is: 194,168.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,961.71 : 643,447.52 = 129,444.89 : x
  2. Step 2: Convert to fraction form
    428,961.71/643,447.52 = 129,444.89/x
  3. Step 3: Cross multiply
    428,961.71x = 643,447.52 × 129,444.89
  4. Step 4: Simplify right side
    428,961.71x = 83,290,990,432.19
  5. Step 5: Solve for x
    x = 83,290,990,432.19/428,961.71
  6. Step 6: Final answer
    x = 194,168.82

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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.