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Finding the Fourth Proportional to 257.45, 386.10 and 154.71

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Solution

The fourth proportional to 257.45, 386.10 and 154.71 is: 232.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.45 : 386.10 = 154.71 : x
  2. Step 2: Convert to fraction form
    257.45/386.10 = 154.71/x
  3. Step 3: Cross multiply
    257.45x = 386.10 × 154.71
  4. Step 4: Simplify right side
    257.45x = 59,733.53
  5. Step 5: Solve for x
    x = 59,733.53/257.45
  6. Step 6: Final answer
    x = 232.02

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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.