Home / 1,211.18-1,818.14-1,131.90

Finding the Fourth Proportional to 1,211.18, 1,818.14 and 1,131.90

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Solution

The fourth proportional to 1,211.18, 1,818.14 and 1,131.90 is: 1,699.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.18 : 1,818.14 = 1,131.90 : x
  2. Step 2: Convert to fraction form
    1,211.18/1,818.14 = 1,131.90/x
  3. Step 3: Cross multiply
    1,211.18x = 1,818.14 × 1,131.90
  4. Step 4: Simplify right side
    1,211.18x = 2,057,952.67
  5. Step 5: Solve for x
    x = 2,057,952.67/1,211.18
  6. Step 6: Final answer
    x = 1,699.13

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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.