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Finding the Fourth Proportional to 1,008.55, 1,512.98 and 423.83

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Solution

The fourth proportional to 1,008.55, 1,512.98 and 423.83 is: 635.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.55 : 1,512.98 = 423.83 : x
  2. Step 2: Convert to fraction form
    1,008.55/1,512.98 = 423.83/x
  3. Step 3: Cross multiply
    1,008.55x = 1,512.98 × 423.83
  4. Step 4: Simplify right side
    1,008.55x = 641,249.57
  5. Step 5: Solve for x
    x = 641,249.57/1,008.55
  6. Step 6: Final answer
    x = 635.81

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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.