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Finding the Fourth Proportional to 927.12, 1,390 and 439.88

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Solution

The fourth proportional to 927.12, 1,390 and 439.88 is: 659.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.12 : 1,390 = 439.88 : x
  2. Step 2: Convert to fraction form
    927.12/1,390 = 439.88/x
  3. Step 3: Cross multiply
    927.12x = 1,390 × 439.88
  4. Step 4: Simplify right side
    927.12x = 611,433.20
  5. Step 5: Solve for x
    x = 611,433.20/927.12
  6. Step 6: Final answer
    x = 659.50

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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.