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Finding the Fourth Proportional to 129.02, 193.48 and 47.85

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Solution

The fourth proportional to 129.02, 193.48 and 47.85 is: 71.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.02 : 193.48 = 47.85 : x
  2. Step 2: Convert to fraction form
    129.02/193.48 = 47.85/x
  3. Step 3: Cross multiply
    129.02x = 193.48 × 47.85
  4. Step 4: Simplify right side
    129.02x = 9,257.05
  5. Step 5: Solve for x
    x = 9,257.05/129.02
  6. Step 6: Final answer
    x = 71.75

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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.