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Finding the Fourth Proportional to 130.68, 179.28 and 122.40

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Solution

The fourth proportional to 130.68, 179.28 and 122.40 is: 167.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.68 : 179.28 = 122.40 : x
  2. Step 2: Convert to fraction form
    130.68/179.28 = 122.40/x
  3. Step 3: Cross multiply
    130.68x = 179.28 × 122.40
  4. Step 4: Simplify right side
    130.68x = 21,943.87
  5. Step 5: Solve for x
    x = 21,943.87/130.68
  6. Step 6: Final answer
    x = 167.92

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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.