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Finding the Fourth Proportional to 130.56, 180.32 and 128.76

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Solution

The fourth proportional to 130.56, 180.32 and 128.76 is: 177.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.56 : 180.32 = 128.76 : x
  2. Step 2: Convert to fraction form
    130.56/180.32 = 128.76/x
  3. Step 3: Cross multiply
    130.56x = 180.32 × 128.76
  4. Step 4: Simplify right side
    130.56x = 23,218.00
  5. Step 5: Solve for x
    x = 23,218.00/130.56
  6. Step 6: Final answer
    x = 177.83

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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.