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Finding the Fourth Proportional to 1,261.20, 1,891.20 and 439.38

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Solution

The fourth proportional to 1,261.20, 1,891.20 and 439.38 is: 658.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.20 : 1,891.20 = 439.38 : x
  2. Step 2: Convert to fraction form
    1,261.20/1,891.20 = 439.38/x
  3. Step 3: Cross multiply
    1,261.20x = 1,891.20 × 439.38
  4. Step 4: Simplify right side
    1,261.20x = 830,957.10
  5. Step 5: Solve for x
    x = 830,957.10/1,261.20
  6. Step 6: Final answer
    x = 658.86

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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.