Home / 1,188.27-1,639.31-839.43

Finding the Fourth Proportional to 1,188.27, 1,639.31 and 839.43

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Solution

The fourth proportional to 1,188.27, 1,639.31 and 839.43 is: 1,158.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.27 : 1,639.31 = 839.43 : x
  2. Step 2: Convert to fraction form
    1,188.27/1,639.31 = 839.43/x
  3. Step 3: Cross multiply
    1,188.27x = 1,639.31 × 839.43
  4. Step 4: Simplify right side
    1,188.27x = 1,376,081.80
  5. Step 5: Solve for x
    x = 1,376,081.80/1,188.27
  6. Step 6: Final answer
    x = 1,158.05

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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.