Home / 428,520.03-642,861.29-172,372.20

Finding the Fourth Proportional to 428,520.03, 642,861.29 and 172,372.20

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Solution

The fourth proportional to 428,520.03, 642,861.29 and 172,372.20 is: 258,590.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,520.03 : 642,861.29 = 172,372.20 : x
  2. Step 2: Convert to fraction form
    428,520.03/642,861.29 = 172,372.20/x
  3. Step 3: Cross multiply
    428,520.03x = 642,861.29 × 172,372.20
  4. Step 4: Simplify right side
    428,520.03x = 110,811,414,852.14
  5. Step 5: Solve for x
    x = 110,811,414,852.14/428,520.03
  6. Step 6: Final answer
    x = 258,590.98

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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.