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Finding the Fourth Proportional to 928.75, 1,393.16 and 517.57

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Solution

The fourth proportional to 928.75, 1,393.16 and 517.57 is: 776.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.75 : 1,393.16 = 517.57 : x
  2. Step 2: Convert to fraction form
    928.75/1,393.16 = 517.57/x
  3. Step 3: Cross multiply
    928.75x = 1,393.16 × 517.57
  4. Step 4: Simplify right side
    928.75x = 721,057.82
  5. Step 5: Solve for x
    x = 721,057.82/928.75
  6. Step 6: Final answer
    x = 776.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.