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Finding the Fourth Proportional to 257.65, 386.57 and 95.45

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Solution

The fourth proportional to 257.65, 386.57 and 95.45 is: 143.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.65 : 386.57 = 95.45 : x
  2. Step 2: Convert to fraction form
    257.65/386.57 = 95.45/x
  3. Step 3: Cross multiply
    257.65x = 386.57 × 95.45
  4. Step 4: Simplify right side
    257.65x = 36,896.41
  5. Step 5: Solve for x
    x = 36,896.41/257.65
  6. Step 6: Final answer
    x = 143.21

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.