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Finding the Fourth Proportional to 1,126.80, 1,689.12 and 396.18

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Solution

The fourth proportional to 1,126.80, 1,689.12 and 396.18 is: 593.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.80 : 1,689.12 = 396.18 : x
  2. Step 2: Convert to fraction form
    1,126.80/1,689.12 = 396.18/x
  3. Step 3: Cross multiply
    1,126.80x = 1,689.12 × 396.18
  4. Step 4: Simplify right side
    1,126.80x = 669,195.56
  5. Step 5: Solve for x
    x = 669,195.56/1,126.80
  6. Step 6: Final answer
    x = 593.89

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Double scale
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1.5x scale

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.