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Finding the Fourth Proportional to 927.98, 1,392.18 and 311.72

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Solution

The fourth proportional to 927.98, 1,392.18 and 311.72 is: 467.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.98 : 1,392.18 = 311.72 : x
  2. Step 2: Convert to fraction form
    927.98/1,392.18 = 311.72/x
  3. Step 3: Cross multiply
    927.98x = 1,392.18 × 311.72
  4. Step 4: Simplify right side
    927.98x = 433,970.35
  5. Step 5: Solve for x
    x = 433,970.35/927.98
  6. Step 6: Final answer
    x = 467.65

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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.