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Finding the Fourth Proportional to 928.92, 1,280.75 and 729.13

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Solution

The fourth proportional to 928.92, 1,280.75 and 729.13 is: 1,005.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.92 : 1,280.75 = 729.13 : x
  2. Step 2: Convert to fraction form
    928.92/1,280.75 = 729.13/x
  3. Step 3: Cross multiply
    928.92x = 1,280.75 × 729.13
  4. Step 4: Simplify right side
    928.92x = 933,833.25
  5. Step 5: Solve for x
    x = 933,833.25/928.92
  6. Step 6: Final answer
    x = 1,005.29

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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.