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Finding the Fourth Proportional to 1,008.85, 1,512.56 and 392.04

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Solution

The fourth proportional to 1,008.85, 1,512.56 and 392.04 is: 587.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.85 : 1,512.56 = 392.04 : x
  2. Step 2: Convert to fraction form
    1,008.85/1,512.56 = 392.04/x
  3. Step 3: Cross multiply
    1,008.85x = 1,512.56 × 392.04
  4. Step 4: Simplify right side
    1,008.85x = 592,984.02
  5. Step 5: Solve for x
    x = 592,984.02/1,008.85
  6. Step 6: Final answer
    x = 587.78

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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.