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Finding the Fourth Proportional to 402.18, 602.61 and 247.79

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Solution

The fourth proportional to 402.18, 602.61 and 247.79 is: 371.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.18 : 602.61 = 247.79 : x
  2. Step 2: Convert to fraction form
    402.18/602.61 = 247.79/x
  3. Step 3: Cross multiply
    402.18x = 602.61 × 247.79
  4. Step 4: Simplify right side
    402.18x = 149,317.72
  5. Step 5: Solve for x
    x = 149,317.72/402.18
  6. Step 6: Final answer
    x = 371.27

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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.