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Finding the Fourth Proportional to 839.18, 1,159.50 and 809.61

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Solution

The fourth proportional to 839.18, 1,159.50 and 809.61 is: 1,118.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.18 : 1,159.50 = 809.61 : x
  2. Step 2: Convert to fraction form
    839.18/1,159.50 = 809.61/x
  3. Step 3: Cross multiply
    839.18x = 1,159.50 × 809.61
  4. Step 4: Simplify right side
    839.18x = 938,742.80
  5. Step 5: Solve for x
    x = 938,742.80/839.18
  6. Step 6: Final answer
    x = 1,118.65

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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.