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Finding the Fourth Proportional to 1,248.69, 1,873.20 and 426.75

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Solution

The fourth proportional to 1,248.69, 1,873.20 and 426.75 is: 640.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.69 : 1,873.20 = 426.75 : x
  2. Step 2: Convert to fraction form
    1,248.69/1,873.20 = 426.75/x
  3. Step 3: Cross multiply
    1,248.69x = 1,873.20 × 426.75
  4. Step 4: Simplify right side
    1,248.69x = 799,388.10
  5. Step 5: Solve for x
    x = 799,388.10/1,248.69
  6. Step 6: Final answer
    x = 640.18

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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.