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Finding the Fourth Proportional to 1,332.99, 1,996.46 and 640.17

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Solution

The fourth proportional to 1,332.99, 1,996.46 and 640.17 is: 958.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.99 : 1,996.46 = 640.17 : x
  2. Step 2: Convert to fraction form
    1,332.99/1,996.46 = 640.17/x
  3. Step 3: Cross multiply
    1,332.99x = 1,996.46 × 640.17
  4. Step 4: Simplify right side
    1,332.99x = 1,278,073.80
  5. Step 5: Solve for x
    x = 1,278,073.80/1,332.99
  6. Step 6: Final answer
    x = 958.80

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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.