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Finding the Fourth Proportional to 757.71, 1,131.04 and 665.45

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Solution

The fourth proportional to 757.71, 1,131.04 and 665.45 is: 993.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.71 : 1,131.04 = 665.45 : x
  2. Step 2: Convert to fraction form
    757.71/1,131.04 = 665.45/x
  3. Step 3: Cross multiply
    757.71x = 1,131.04 × 665.45
  4. Step 4: Simplify right side
    757.71x = 752,646.08
  5. Step 5: Solve for x
    x = 752,646.08/757.71
  6. Step 6: Final answer
    x = 993.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.