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Finding the Fourth Proportional to 231.28, 319.12 and 131.70

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Solution

The fourth proportional to 231.28, 319.12 and 131.70 is: 181.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.28 : 319.12 = 131.70 : x
  2. Step 2: Convert to fraction form
    231.28/319.12 = 131.70/x
  3. Step 3: Cross multiply
    231.28x = 319.12 × 131.70
  4. Step 4: Simplify right side
    231.28x = 42,028.10
  5. Step 5: Solve for x
    x = 42,028.10/231.28
  6. Step 6: Final answer
    x = 181.72

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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.