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Finding the Fourth Proportional to 129.80, 179.18 and 92.98

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Solution

The fourth proportional to 129.80, 179.18 and 92.98 is: 128.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.80 : 179.18 = 92.98 : x
  2. Step 2: Convert to fraction form
    129.80/179.18 = 92.98/x
  3. Step 3: Cross multiply
    129.80x = 179.18 × 92.98
  4. Step 4: Simplify right side
    129.80x = 16,660.26
  5. Step 5: Solve for x
    x = 16,660.26/129.80
  6. Step 6: Final answer
    x = 128.35

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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.