Home / 1,121.40-1,549.45-1,081.98

Finding the Fourth Proportional to 1,121.40, 1,549.45 and 1,081.98

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Solution

The fourth proportional to 1,121.40, 1,549.45 and 1,081.98 is: 1,494.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.40 : 1,549.45 = 1,081.98 : x
  2. Step 2: Convert to fraction form
    1,121.40/1,549.45 = 1,081.98/x
  3. Step 3: Cross multiply
    1,121.40x = 1,549.45 × 1,081.98
  4. Step 4: Simplify right side
    1,121.40x = 1,676,473.91
  5. Step 5: Solve for x
    x = 1,676,473.91/1,121.40
  6. Step 6: Final answer
    x = 1,494.98

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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.