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Finding the Fourth Proportional to 257.42, 386.15 and 154.69

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Solution

The fourth proportional to 257.42, 386.15 and 154.69 is: 232.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.42 : 386.15 = 154.69 : x
  2. Step 2: Convert to fraction form
    257.42/386.15 = 154.69/x
  3. Step 3: Cross multiply
    257.42x = 386.15 × 154.69
  4. Step 4: Simplify right side
    257.42x = 59,731.80
  5. Step 5: Solve for x
    x = 59,731.80/257.42
  6. Step 6: Final answer
    x = 232.04

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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.