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Finding the Fourth Proportional to 1,011.29, 1,516.94 and 660.69

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Solution

The fourth proportional to 1,011.29, 1,516.94 and 660.69 is: 991.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.29 : 1,516.94 = 660.69 : x
  2. Step 2: Convert to fraction form
    1,011.29/1,516.94 = 660.69/x
  3. Step 3: Cross multiply
    1,011.29x = 1,516.94 × 660.69
  4. Step 4: Simplify right side
    1,011.29x = 1,002,223.79
  5. Step 5: Solve for x
    x = 1,002,223.79/1,011.29
  6. Step 6: Final answer
    x = 991.04

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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.