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Finding the Fourth Proportional to 131.79, 181.65 and 108.39

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Solution

The fourth proportional to 131.79, 181.65 and 108.39 is: 149.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.79 : 181.65 = 108.39 : x
  2. Step 2: Convert to fraction form
    131.79/181.65 = 108.39/x
  3. Step 3: Cross multiply
    131.79x = 181.65 × 108.39
  4. Step 4: Simplify right side
    131.79x = 19,689.04
  5. Step 5: Solve for x
    x = 19,689.04/131.79
  6. Step 6: Final answer
    x = 149.40

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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.