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Finding the Fourth Proportional to 1,418.48, 2,125.92 and 638

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Solution

The fourth proportional to 1,418.48, 2,125.92 and 638 is: 956.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.48 : 2,125.92 = 638 : x
  2. Step 2: Convert to fraction form
    1,418.48/2,125.92 = 638/x
  3. Step 3: Cross multiply
    1,418.48x = 2,125.92 × 638
  4. Step 4: Simplify right side
    1,418.48x = 1,356,336.96
  5. Step 5: Solve for x
    x = 1,356,336.96/1,418.48
  6. Step 6: Final answer
    x = 956.19

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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.