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Finding the Fourth Proportional to 130.80, 180.22 and 115.40

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Solution

The fourth proportional to 130.80, 180.22 and 115.40 is: 159.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.80 : 180.22 = 115.40 : x
  2. Step 2: Convert to fraction form
    130.80/180.22 = 115.40/x
  3. Step 3: Cross multiply
    130.80x = 180.22 × 115.40
  4. Step 4: Simplify right side
    130.80x = 20,797.39
  5. Step 5: Solve for x
    x = 20,797.39/130.80
  6. Step 6: Final answer
    x = 159.00

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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.