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Finding the Fourth Proportional to 257.92, 387.15 and 95.65

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Solution

The fourth proportional to 257.92, 387.15 and 95.65 is: 143.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.92 : 387.15 = 95.65 : x
  2. Step 2: Convert to fraction form
    257.92/387.15 = 95.65/x
  3. Step 3: Cross multiply
    257.92x = 387.15 × 95.65
  4. Step 4: Simplify right side
    257.92x = 37,030.90
  5. Step 5: Solve for x
    x = 37,030.90/257.92
  6. Step 6: Final answer
    x = 143.58

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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.