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Finding the Fourth Proportional to 425,808.20, 639,230.70 and 215,337.80

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Solution

The fourth proportional to 425,808.20, 639,230.70 and 215,337.80 is: 323,268.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,808.20 : 639,230.70 = 215,337.80 : x
  2. Step 2: Convert to fraction form
    425,808.20/639,230.70 = 215,337.80/x
  3. Step 3: Cross multiply
    425,808.20x = 639,230.70 × 215,337.80
  4. Step 4: Simplify right side
    425,808.20x = 137,650,532,630.46
  5. Step 5: Solve for x
    x = 137,650,532,630.46/425,808.20
  6. Step 6: Final answer
    x = 323,268.86

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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.