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Finding the Fourth Proportional to 1,405.29, 1,939.92 and 908.17

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Solution

The fourth proportional to 1,405.29, 1,939.92 and 908.17 is: 1,253.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.29 : 1,939.92 = 908.17 : x
  2. Step 2: Convert to fraction form
    1,405.29/1,939.92 = 908.17/x
  3. Step 3: Cross multiply
    1,405.29x = 1,939.92 × 908.17
  4. Step 4: Simplify right side
    1,405.29x = 1,761,778.18
  5. Step 5: Solve for x
    x = 1,761,778.18/1,405.29
  6. Step 6: Final answer
    x = 1,253.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.