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Finding the Fourth Proportional to 1,008.79, 1,512.69 and 423.61

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Solution

The fourth proportional to 1,008.79, 1,512.69 and 423.61 is: 635.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.79 : 1,512.69 = 423.61 : x
  2. Step 2: Convert to fraction form
    1,008.79/1,512.69 = 423.61/x
  3. Step 3: Cross multiply
    1,008.79x = 1,512.69 × 423.61
  4. Step 4: Simplify right side
    1,008.79x = 640,790.61
  5. Step 5: Solve for x
    x = 640,790.61/1,008.79
  6. Step 6: Final answer
    x = 635.21

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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.