Home / 1,011.20-1,517.49-664.70

Finding the Fourth Proportional to 1,011.20, 1,517.49 and 664.70

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Solution

The fourth proportional to 1,011.20, 1,517.49 and 664.70 is: 997.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.20 : 1,517.49 = 664.70 : x
  2. Step 2: Convert to fraction form
    1,011.20/1,517.49 = 664.70/x
  3. Step 3: Cross multiply
    1,011.20x = 1,517.49 × 664.70
  4. Step 4: Simplify right side
    1,011.20x = 1,008,668.02
  5. Step 5: Solve for x
    x = 1,008,668.02/1,011.20
  6. Step 6: Final answer
    x = 997.50

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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.