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Finding the Fourth Proportional to 1,260.85, 1,891.28 and 438.92

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Solution

The fourth proportional to 1,260.85, 1,891.28 and 438.92 is: 658.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.85 : 1,891.28 = 438.92 : x
  2. Step 2: Convert to fraction form
    1,260.85/1,891.28 = 438.92/x
  3. Step 3: Cross multiply
    1,260.85x = 1,891.28 × 438.92
  4. Step 4: Simplify right side
    1,260.85x = 830,127.52
  5. Step 5: Solve for x
    x = 830,127.52/1,260.85
  6. Step 6: Final answer
    x = 658.39

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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.