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Finding the Fourth Proportional to 129.18, 194.78 and 124.98

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Solution

The fourth proportional to 129.18, 194.78 and 124.98 is: 188.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.18 : 194.78 = 124.98 : x
  2. Step 2: Convert to fraction form
    129.18/194.78 = 124.98/x
  3. Step 3: Cross multiply
    129.18x = 194.78 × 124.98
  4. Step 4: Simplify right side
    129.18x = 24,343.60
  5. Step 5: Solve for x
    x = 24,343.60/129.18
  6. Step 6: Final answer
    x = 188.45

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.