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Finding the Fourth Proportional to 1,180.76, 1,769.68 and 487

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Solution

The fourth proportional to 1,180.76, 1,769.68 and 487 is: 729.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.76 : 1,769.68 = 487 : x
  2. Step 2: Convert to fraction form
    1,180.76/1,769.68 = 487/x
  3. Step 3: Cross multiply
    1,180.76x = 1,769.68 × 487
  4. Step 4: Simplify right side
    1,180.76x = 861,834.16
  5. Step 5: Solve for x
    x = 861,834.16/1,180.76
  6. Step 6: Final answer
    x = 729.90

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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.