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Finding the Fourth Proportional to 131.76, 181.08 and 122.40

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Solution

The fourth proportional to 131.76, 181.08 and 122.40 is: 168.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.76 : 181.08 = 122.40 : x
  2. Step 2: Convert to fraction form
    131.76/181.08 = 122.40/x
  3. Step 3: Cross multiply
    131.76x = 181.08 × 122.40
  4. Step 4: Simplify right side
    131.76x = 22,164.19
  5. Step 5: Solve for x
    x = 22,164.19/131.76
  6. Step 6: Final answer
    x = 168.22

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.