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Finding the Fourth Proportional to 130.08, 194.72 and 86.20

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Solution

The fourth proportional to 130.08, 194.72 and 86.20 is: 129.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.08 : 194.72 = 86.20 : x
  2. Step 2: Convert to fraction form
    130.08/194.72 = 86.20/x
  3. Step 3: Cross multiply
    130.08x = 194.72 × 86.20
  4. Step 4: Simplify right side
    130.08x = 16,784.86
  5. Step 5: Solve for x
    x = 16,784.86/130.08
  6. Step 6: Final answer
    x = 129.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.