Home / 1,247.11-1,871.21-478.15

Finding the Fourth Proportional to 1,247.11, 1,871.21 and 478.15

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Solution

The fourth proportional to 1,247.11, 1,871.21 and 478.15 is: 717.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.11 : 1,871.21 = 478.15 : x
  2. Step 2: Convert to fraction form
    1,247.11/1,871.21 = 478.15/x
  3. Step 3: Cross multiply
    1,247.11x = 1,871.21 × 478.15
  4. Step 4: Simplify right side
    1,247.11x = 894,716.67
  5. Step 5: Solve for x
    x = 894,716.67/1,247.11
  6. Step 6: Final answer
    x = 717.43

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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.