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Finding the Fourth Proportional to 230.86, 318.45 and 143.47

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Solution

The fourth proportional to 230.86, 318.45 and 143.47 is: 197.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.86 : 318.45 = 143.47 : x
  2. Step 2: Convert to fraction form
    230.86/318.45 = 143.47/x
  3. Step 3: Cross multiply
    230.86x = 318.45 × 143.47
  4. Step 4: Simplify right side
    230.86x = 45,688.02
  5. Step 5: Solve for x
    x = 45,688.02/230.86
  6. Step 6: Final answer
    x = 197.90

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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.