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Finding the Fourth Proportional to 129.80, 194.52 and 56.60

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Solution

The fourth proportional to 129.80, 194.52 and 56.60 is: 84.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.80 : 194.52 = 56.60 : x
  2. Step 2: Convert to fraction form
    129.80/194.52 = 56.60/x
  3. Step 3: Cross multiply
    129.80x = 194.52 × 56.60
  4. Step 4: Simplify right side
    129.80x = 11,009.83
  5. Step 5: Solve for x
    x = 11,009.83/129.80
  6. Step 6: Final answer
    x = 84.82

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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.