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Finding the Fourth Proportional to 230.88, 318.69 and 172.71

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Solution

The fourth proportional to 230.88, 318.69 and 172.71 is: 238.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.88 : 318.69 = 172.71 : x
  2. Step 2: Convert to fraction form
    230.88/318.69 = 172.71/x
  3. Step 3: Cross multiply
    230.88x = 318.69 × 172.71
  4. Step 4: Simplify right side
    230.88x = 55,040.95
  5. Step 5: Solve for x
    x = 55,040.95/230.88
  6. Step 6: Final answer
    x = 238.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.