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Finding the Fourth Proportional to 2,819.53, 4,228.17 and 871.21

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Solution

The fourth proportional to 2,819.53, 4,228.17 and 871.21 is: 1,306.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,819.53 : 4,228.17 = 871.21 : x
  2. Step 2: Convert to fraction form
    2,819.53/4,228.17 = 871.21/x
  3. Step 3: Cross multiply
    2,819.53x = 4,228.17 × 871.21
  4. Step 4: Simplify right side
    2,819.53x = 3,683,623.99
  5. Step 5: Solve for x
    x = 3,683,623.99/2,819.53
  6. Step 6: Final answer
    x = 1,306.47

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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.