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Finding the Fourth Proportional to 1,487.70, 2,230.92 and 513.90

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Solution

The fourth proportional to 1,487.70, 2,230.92 and 513.90 is: 770.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.70 : 2,230.92 = 513.90 : x
  2. Step 2: Convert to fraction form
    1,487.70/2,230.92 = 513.90/x
  3. Step 3: Cross multiply
    1,487.70x = 2,230.92 × 513.90
  4. Step 4: Simplify right side
    1,487.70x = 1,146,469.79
  5. Step 5: Solve for x
    x = 1,146,469.79/1,487.70
  6. Step 6: Final answer
    x = 770.63

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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.