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Finding the Fourth Proportional to 1,143.62, 1,715.43 and 1,121.75

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Solution

The fourth proportional to 1,143.62, 1,715.43 and 1,121.75 is: 1,682.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.62 : 1,715.43 = 1,121.75 : x
  2. Step 2: Convert to fraction form
    1,143.62/1,715.43 = 1,121.75/x
  3. Step 3: Cross multiply
    1,143.62x = 1,715.43 × 1,121.75
  4. Step 4: Simplify right side
    1,143.62x = 1,924,279.35
  5. Step 5: Solve for x
    x = 1,924,279.35/1,143.62
  6. Step 6: Final answer
    x = 1,682.62

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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.