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Finding the Fourth Proportional to 231.15, 318.99 and 130.22

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Solution

The fourth proportional to 231.15, 318.99 and 130.22 is: 179.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.15 : 318.99 = 130.22 : x
  2. Step 2: Convert to fraction form
    231.15/318.99 = 130.22/x
  3. Step 3: Cross multiply
    231.15x = 318.99 × 130.22
  4. Step 4: Simplify right side
    231.15x = 41,536.63
  5. Step 5: Solve for x
    x = 41,536.63/231.15
  6. Step 6: Final answer
    x = 179.70

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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.