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Finding the Fourth Proportional to 1,474.24, 2,211.20 and 448

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Solution

The fourth proportional to 1,474.24, 2,211.20 and 448 is: 671.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,474.24 : 2,211.20 = 448 : x
  2. Step 2: Convert to fraction form
    1,474.24/2,211.20 = 448/x
  3. Step 3: Cross multiply
    1,474.24x = 2,211.20 × 448
  4. Step 4: Simplify right side
    1,474.24x = 990,617.60
  5. Step 5: Solve for x
    x = 990,617.60/1,474.24
  6. Step 6: Final answer
    x = 671.95

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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.