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Finding the Fourth Proportional to 257.54, 385.78 and 159.72

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Solution

The fourth proportional to 257.54, 385.78 and 159.72 is: 239.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.54 : 385.78 = 159.72 : x
  2. Step 2: Convert to fraction form
    257.54/385.78 = 159.72/x
  3. Step 3: Cross multiply
    257.54x = 385.78 × 159.72
  4. Step 4: Simplify right side
    257.54x = 61,616.78
  5. Step 5: Solve for x
    x = 61,616.78/257.54
  6. Step 6: Final answer
    x = 239.25

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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.