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Finding the Fourth Proportional to 767.92, 1,147.13 and 690.76

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Solution

The fourth proportional to 767.92, 1,147.13 and 690.76 is: 1,031.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.92 : 1,147.13 = 690.76 : x
  2. Step 2: Convert to fraction form
    767.92/1,147.13 = 690.76/x
  3. Step 3: Cross multiply
    767.92x = 1,147.13 × 690.76
  4. Step 4: Simplify right side
    767.92x = 792,391.52
  5. Step 5: Solve for x
    x = 792,391.52/767.92
  6. Step 6: Final answer
    x = 1,031.87

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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.