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Finding the Fourth Proportional to 355.90, 534.18 and 247.78

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Solution

The fourth proportional to 355.90, 534.18 and 247.78 is: 371.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.90 : 534.18 = 247.78 : x
  2. Step 2: Convert to fraction form
    355.90/534.18 = 247.78/x
  3. Step 3: Cross multiply
    355.90x = 534.18 × 247.78
  4. Step 4: Simplify right side
    355.90x = 132,359.12
  5. Step 5: Solve for x
    x = 132,359.12/355.90
  6. Step 6: Final answer
    x = 371.90

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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.