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Finding the Fourth Proportional to 765.92, 1,143.69 and 666.56

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Solution

The fourth proportional to 765.92, 1,143.69 and 666.56 is: 995.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.92 : 1,143.69 = 666.56 : x
  2. Step 2: Convert to fraction form
    765.92/1,143.69 = 666.56/x
  3. Step 3: Cross multiply
    765.92x = 1,143.69 × 666.56
  4. Step 4: Simplify right side
    765.92x = 762,338.01
  5. Step 5: Solve for x
    x = 762,338.01/765.92
  6. Step 6: Final answer
    x = 995.32

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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.