Home / 428,520.53-642,862.04-172,372.70

Finding the Fourth Proportional to 428,520.53, 642,862.04 and 172,372.70

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Solution

The fourth proportional to 428,520.53, 642,862.04 and 172,372.70 is: 258,591.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,520.53 : 642,862.04 = 172,372.70 : x
  2. Step 2: Convert to fraction form
    428,520.53/642,862.04 = 172,372.70/x
  3. Step 3: Cross multiply
    428,520.53x = 642,862.04 × 172,372.70
  4. Step 4: Simplify right side
    428,520.53x = 110,811,861,486.13
  5. Step 5: Solve for x
    x = 110,811,861,486.13/428,520.53
  6. Step 6: Final answer
    x = 258,591.72

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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.