Home / 428,966.57-643,454.40-129,449.78

Finding the Fourth Proportional to 428,966.57, 643,454.40 and 129,449.78

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Solution

The fourth proportional to 428,966.57, 643,454.40 and 129,449.78 is: 194,176.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,966.57 : 643,454.40 = 129,449.78 : x
  2. Step 2: Convert to fraction form
    428,966.57/643,454.40 = 129,449.78/x
  3. Step 3: Cross multiply
    428,966.57x = 643,454.40 × 129,449.78
  4. Step 4: Simplify right side
    428,966.57x = 83,295,027,302.76
  5. Step 5: Solve for x
    x = 83,295,027,302.76/428,966.57
  6. Step 6: Final answer
    x = 194,176.04

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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.