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Finding the Fourth Proportional to 1,520.91, 2,281.14 and 425.30

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Solution

The fourth proportional to 1,520.91, 2,281.14 and 425.30 is: 637.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.91 : 2,281.14 = 425.30 : x
  2. Step 2: Convert to fraction form
    1,520.91/2,281.14 = 425.30/x
  3. Step 3: Cross multiply
    1,520.91x = 2,281.14 × 425.30
  4. Step 4: Simplify right side
    1,520.91x = 970,157.44
  5. Step 5: Solve for x
    x = 970,157.44/1,520.91
  6. Step 6: Final answer
    x = 637.88

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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.