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Finding the Fourth Proportional to 1,008.02, 1,512.06 and 391.70

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Solution

The fourth proportional to 1,008.02, 1,512.06 and 391.70 is: 587.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.02 : 1,512.06 = 391.70 : x
  2. Step 2: Convert to fraction form
    1,008.02/1,512.06 = 391.70/x
  3. Step 3: Cross multiply
    1,008.02x = 1,512.06 × 391.70
  4. Step 4: Simplify right side
    1,008.02x = 592,273.90
  5. Step 5: Solve for x
    x = 592,273.90/1,008.02
  6. Step 6: Final answer
    x = 587.56

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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.