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Finding the Fourth Proportional to 928.18, 1,392.20 and 278.85

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Solution

The fourth proportional to 928.18, 1,392.20 and 278.85 is: 418.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.18 : 1,392.20 = 278.85 : x
  2. Step 2: Convert to fraction form
    928.18/1,392.20 = 278.85/x
  3. Step 3: Cross multiply
    928.18x = 1,392.20 × 278.85
  4. Step 4: Simplify right side
    928.18x = 388,214.97
  5. Step 5: Solve for x
    x = 388,214.97/928.18
  6. Step 6: Final answer
    x = 418.25

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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.