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Finding the Fourth Proportional to 928.80, 1,392.20 and 517.52

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Solution

The fourth proportional to 928.80, 1,392.20 and 517.52 is: 775.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.80 : 1,392.20 = 517.52 : x
  2. Step 2: Convert to fraction form
    928.80/1,392.20 = 517.52/x
  3. Step 3: Cross multiply
    928.80x = 1,392.20 × 517.52
  4. Step 4: Simplify right side
    928.80x = 720,491.34
  5. Step 5: Solve for x
    x = 720,491.34/928.80
  6. Step 6: Final answer
    x = 775.72

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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.