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Finding the Fourth Proportional to 927.20, 1,390.90 and 310.88

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Solution

The fourth proportional to 927.20, 1,390.90 and 310.88 is: 466.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.20 : 1,390.90 = 310.88 : x
  2. Step 2: Convert to fraction form
    927.20/1,390.90 = 310.88/x
  3. Step 3: Cross multiply
    927.20x = 1,390.90 × 310.88
  4. Step 4: Simplify right side
    927.20x = 432,402.99
  5. Step 5: Solve for x
    x = 432,402.99/927.20
  6. Step 6: Final answer
    x = 466.35

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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.