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Finding the Fourth Proportional to 129.86, 193.51 and 126.15

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Solution

The fourth proportional to 129.86, 193.51 and 126.15 is: 187.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.86 : 193.51 = 126.15 : x
  2. Step 2: Convert to fraction form
    129.86/193.51 = 126.15/x
  3. Step 3: Cross multiply
    129.86x = 193.51 × 126.15
  4. Step 4: Simplify right side
    129.86x = 24,410.72
  5. Step 5: Solve for x
    x = 24,410.72/129.86
  6. Step 6: Final answer
    x = 187.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.