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Finding the Fourth Proportional to 425,982.70, 639,492.45 and 215,512.30

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Solution

The fourth proportional to 425,982.70, 639,492.45 and 215,512.30 is: 323,530.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,982.70 : 639,492.45 = 215,512.30 : x
  2. Step 2: Convert to fraction form
    425,982.70/639,492.45 = 215,512.30/x
  3. Step 3: Cross multiply
    425,982.70x = 639,492.45 × 215,512.30
  4. Step 4: Simplify right side
    425,982.70x = 137,818,488,732.14
  5. Step 5: Solve for x
    x = 137,818,488,732.14/425,982.70
  6. Step 6: Final answer
    x = 323,530.72

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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.