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Finding the Fourth Proportional to 231.15, 318.98 and 131.57

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Solution

The fourth proportional to 231.15, 318.98 and 131.57 is: 181.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.15 : 318.98 = 131.57 : x
  2. Step 2: Convert to fraction form
    231.15/318.98 = 131.57/x
  3. Step 3: Cross multiply
    231.15x = 318.98 × 131.57
  4. Step 4: Simplify right side
    231.15x = 41,966.31
  5. Step 5: Solve for x
    x = 41,966.31/231.15
  6. Step 6: Final answer
    x = 181.56

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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.