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Finding the Fourth Proportional to 2,169.70, 3,254.71 and 871.17

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Solution

The fourth proportional to 2,169.70, 3,254.71 and 871.17 is: 1,306.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,169.70 : 3,254.71 = 871.17 : x
  2. Step 2: Convert to fraction form
    2,169.70/3,254.71 = 871.17/x
  3. Step 3: Cross multiply
    2,169.70x = 3,254.71 × 871.17
  4. Step 4: Simplify right side
    2,169.70x = 2,835,408.82
  5. Step 5: Solve for x
    x = 2,835,408.82/2,169.70
  6. Step 6: Final answer
    x = 1,306.82

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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.