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Finding the Fourth Proportional to 1,008.20, 1,512.56 and 391.74

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Solution

The fourth proportional to 1,008.20, 1,512.56 and 391.74 is: 587.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.20 : 1,512.56 = 391.74 : x
  2. Step 2: Convert to fraction form
    1,008.20/1,512.56 = 391.74/x
  3. Step 3: Cross multiply
    1,008.20x = 1,512.56 × 391.74
  4. Step 4: Simplify right side
    1,008.20x = 592,530.25
  5. Step 5: Solve for x
    x = 592,530.25/1,008.20
  6. Step 6: Final answer
    x = 587.71

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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.