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Finding the Fourth Proportional to 130.45, 179.93 and 86.78

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Solution

The fourth proportional to 130.45, 179.93 and 86.78 is: 119.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.45 : 179.93 = 86.78 : x
  2. Step 2: Convert to fraction form
    130.45/179.93 = 86.78/x
  3. Step 3: Cross multiply
    130.45x = 179.93 × 86.78
  4. Step 4: Simplify right side
    130.45x = 15,614.33
  5. Step 5: Solve for x
    x = 15,614.33/130.45
  6. Step 6: Final answer
    x = 119.70

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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.