Home / 1,116.20-1,672.65-808.70

Finding the Fourth Proportional to 1,116.20, 1,672.65 and 808.70

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Solution

The fourth proportional to 1,116.20, 1,672.65 and 808.70 is: 1,211.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.20 : 1,672.65 = 808.70 : x
  2. Step 2: Convert to fraction form
    1,116.20/1,672.65 = 808.70/x
  3. Step 3: Cross multiply
    1,116.20x = 1,672.65 × 808.70
  4. Step 4: Simplify right side
    1,116.20x = 1,352,672.06
  5. Step 5: Solve for x
    x = 1,352,672.06/1,116.20
  6. Step 6: Final answer
    x = 1,211.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.