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Finding the Fourth Proportional to 257.66, 355.55 and 159.39

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Solution

The fourth proportional to 257.66, 355.55 and 159.39 is: 219.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.66 : 355.55 = 159.39 : x
  2. Step 2: Convert to fraction form
    257.66/355.55 = 159.39/x
  3. Step 3: Cross multiply
    257.66x = 355.55 × 159.39
  4. Step 4: Simplify right side
    257.66x = 56,670.32
  5. Step 5: Solve for x
    x = 56,670.32/257.66
  6. Step 6: Final answer
    x = 219.95

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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.