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Finding the Fourth Proportional to 130.15, 179.72 and 86.68

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Solution

The fourth proportional to 130.15, 179.72 and 86.68 is: 119.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.15 : 179.72 = 86.68 : x
  2. Step 2: Convert to fraction form
    130.15/179.72 = 86.68/x
  3. Step 3: Cross multiply
    130.15x = 179.72 × 86.68
  4. Step 4: Simplify right side
    130.15x = 15,577.70
  5. Step 5: Solve for x
    x = 15,577.70/130.15
  6. Step 6: Final answer
    x = 119.69

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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.