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Finding the Fourth Proportional to 131.90, 181.59 and 112.38

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Solution

The fourth proportional to 131.90, 181.59 and 112.38 is: 154.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.90 : 181.59 = 112.38 : x
  2. Step 2: Convert to fraction form
    131.90/181.59 = 112.38/x
  3. Step 3: Cross multiply
    131.90x = 181.59 × 112.38
  4. Step 4: Simplify right side
    131.90x = 20,407.08
  5. Step 5: Solve for x
    x = 20,407.08/131.90
  6. Step 6: Final answer
    x = 154.72

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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.