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Finding the Fourth Proportional to 1,126, 1,687.72 and 851.20

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Solution

The fourth proportional to 1,126, 1,687.72 and 851.20 is: 1,275.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126 : 1,687.72 = 851.20 : x
  2. Step 2: Convert to fraction form
    1,126/1,687.72 = 851.20/x
  3. Step 3: Cross multiply
    1,126x = 1,687.72 × 851.20
  4. Step 4: Simplify right side
    1,126x = 1,436,587.26
  5. Step 5: Solve for x
    x = 1,436,587.26/1,126
  6. Step 6: Final answer
    x = 1,275.83

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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.