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Finding the Fourth Proportional to 1,039.22, 1,436.15 and 839.65

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Solution

The fourth proportional to 1,039.22, 1,436.15 and 839.65 is: 1,160.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.22 : 1,436.15 = 839.65 : x
  2. Step 2: Convert to fraction form
    1,039.22/1,436.15 = 839.65/x
  3. Step 3: Cross multiply
    1,039.22x = 1,436.15 × 839.65
  4. Step 4: Simplify right side
    1,039.22x = 1,205,863.35
  5. Step 5: Solve for x
    x = 1,205,863.35/1,039.22
  6. Step 6: Final answer
    x = 1,160.35

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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.