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Finding the Fourth Proportional to 1,260.90, 1,891.08 and 439.20

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Solution

The fourth proportional to 1,260.90, 1,891.08 and 439.20 is: 658.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.90 : 1,891.08 = 439.20 : x
  2. Step 2: Convert to fraction form
    1,260.90/1,891.08 = 439.20/x
  3. Step 3: Cross multiply
    1,260.90x = 1,891.08 × 439.20
  4. Step 4: Simplify right side
    1,260.90x = 830,562.34
  5. Step 5: Solve for x
    x = 830,562.34/1,260.90
  6. Step 6: Final answer
    x = 658.71

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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.