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Finding the Fourth Proportional to 258.90, 357.41 and 247.15

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Solution

The fourth proportional to 258.90, 357.41 and 247.15 is: 341.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.90 : 357.41 = 247.15 : x
  2. Step 2: Convert to fraction form
    258.90/357.41 = 247.15/x
  3. Step 3: Cross multiply
    258.90x = 357.41 × 247.15
  4. Step 4: Simplify right side
    258.90x = 88,334.95
  5. Step 5: Solve for x
    x = 88,334.95/258.90
  6. Step 6: Final answer
    x = 341.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.