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Finding the Fourth Proportional to 131.07, 179.67 and 129.45

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Solution

The fourth proportional to 131.07, 179.67 and 129.45 is: 177.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.07 : 179.67 = 129.45 : x
  2. Step 2: Convert to fraction form
    131.07/179.67 = 129.45/x
  3. Step 3: Cross multiply
    131.07x = 179.67 × 129.45
  4. Step 4: Simplify right side
    131.07x = 23,258.28
  5. Step 5: Solve for x
    x = 23,258.28/131.07
  6. Step 6: Final answer
    x = 177.45

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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.