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Finding the Fourth Proportional to 928.71, 1,392.08 and 311.85

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Solution

The fourth proportional to 928.71, 1,392.08 and 311.85 is: 467.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.71 : 1,392.08 = 311.85 : x
  2. Step 2: Convert to fraction form
    928.71/1,392.08 = 311.85/x
  3. Step 3: Cross multiply
    928.71x = 1,392.08 × 311.85
  4. Step 4: Simplify right side
    928.71x = 434,118.59
  5. Step 5: Solve for x
    x = 434,118.59/928.71
  6. Step 6: Final answer
    x = 467.44

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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.