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Finding the Fourth Proportional to 927.20, 1,390.70 and 379.44

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Solution

The fourth proportional to 927.20, 1,390.70 and 379.44 is: 569.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.20 : 1,390.70 = 379.44 : x
  2. Step 2: Convert to fraction form
    927.20/1,390.70 = 379.44/x
  3. Step 3: Cross multiply
    927.20x = 1,390.70 × 379.44
  4. Step 4: Simplify right side
    927.20x = 527,687.21
  5. Step 5: Solve for x
    x = 527,687.21/927.20
  6. Step 6: Final answer
    x = 569.12

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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.