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Finding the Fourth Proportional to 1,487.16, 2,230.20 and 513

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Solution

The fourth proportional to 1,487.16, 2,230.20 and 513 is: 769.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.16 : 2,230.20 = 513 : x
  2. Step 2: Convert to fraction form
    1,487.16/2,230.20 = 513/x
  3. Step 3: Cross multiply
    1,487.16x = 2,230.20 × 513
  4. Step 4: Simplify right side
    1,487.16x = 1,144,092.60
  5. Step 5: Solve for x
    x = 1,144,092.60/1,487.16
  6. Step 6: Final answer
    x = 769.31

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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.