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Finding the Fourth Proportional to 258.18, 355.90 and 202.74

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Solution

The fourth proportional to 258.18, 355.90 and 202.74 is: 279.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.18 : 355.90 = 202.74 : x
  2. Step 2: Convert to fraction form
    258.18/355.90 = 202.74/x
  3. Step 3: Cross multiply
    258.18x = 355.90 × 202.74
  4. Step 4: Simplify right side
    258.18x = 72,155.17
  5. Step 5: Solve for x
    x = 72,155.17/258.18
  6. Step 6: Final answer
    x = 279.48

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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.