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Finding the Fourth Proportional to 257.91, 355.91 and 159.72

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Solution

The fourth proportional to 257.91, 355.91 and 159.72 is: 220.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.91 : 355.91 = 159.72 : x
  2. Step 2: Convert to fraction form
    257.91/355.91 = 159.72/x
  3. Step 3: Cross multiply
    257.91x = 355.91 × 159.72
  4. Step 4: Simplify right side
    257.91x = 56,846.71
  5. Step 5: Solve for x
    x = 56,846.71/257.91
  6. Step 6: Final answer
    x = 220.42

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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.