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Finding the Fourth Proportional to 928.12, 1,392.16 and 372.95

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Solution

The fourth proportional to 928.12, 1,392.16 and 372.95 is: 559.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.12 : 1,392.16 = 372.95 : x
  2. Step 2: Convert to fraction form
    928.12/1,392.16 = 372.95/x
  3. Step 3: Cross multiply
    928.12x = 1,392.16 × 372.95
  4. Step 4: Simplify right side
    928.12x = 519,204.21
  5. Step 5: Solve for x
    x = 519,204.21/928.12
  6. Step 6: Final answer
    x = 559.42

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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.