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Finding the Fourth Proportional to 928.13, 1,280.30 and 769.86

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Solution

The fourth proportional to 928.13, 1,280.30 and 769.86 is: 1,061.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.13 : 1,280.30 = 769.86 : x
  2. Step 2: Convert to fraction form
    928.13/1,280.30 = 769.86/x
  3. Step 3: Cross multiply
    928.13x = 1,280.30 × 769.86
  4. Step 4: Simplify right side
    928.13x = 985,647.91
  5. Step 5: Solve for x
    x = 985,647.91/928.13
  6. Step 6: Final answer
    x = 1,061.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.