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Finding the Fourth Proportional to 257.90, 387.03 and 95.72

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Solution

The fourth proportional to 257.90, 387.03 and 95.72 is: 143.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.90 : 387.03 = 95.72 : x
  2. Step 2: Convert to fraction form
    257.90/387.03 = 95.72/x
  3. Step 3: Cross multiply
    257.90x = 387.03 × 95.72
  4. Step 4: Simplify right side
    257.90x = 37,046.51
  5. Step 5: Solve for x
    x = 37,046.51/257.90
  6. Step 6: Final answer
    x = 143.65

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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.