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Finding the Fourth Proportional to 1,081.71, 1,489.05 and 971.15

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Solution

The fourth proportional to 1,081.71, 1,489.05 and 971.15 is: 1,336.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.71 : 1,489.05 = 971.15 : x
  2. Step 2: Convert to fraction form
    1,081.71/1,489.05 = 971.15/x
  3. Step 3: Cross multiply
    1,081.71x = 1,489.05 × 971.15
  4. Step 4: Simplify right side
    1,081.71x = 1,446,083.46
  5. Step 5: Solve for x
    x = 1,446,083.46/1,081.71
  6. Step 6: Final answer
    x = 1,336.85

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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.