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Finding the Fourth Proportional to 129.61, 193.73 and 126.53

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Solution

The fourth proportional to 129.61, 193.73 and 126.53 is: 189.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.61 : 193.73 = 126.53 : x
  2. Step 2: Convert to fraction form
    129.61/193.73 = 126.53/x
  3. Step 3: Cross multiply
    129.61x = 193.73 × 126.53
  4. Step 4: Simplify right side
    129.61x = 24,512.51
  5. Step 5: Solve for x
    x = 24,512.51/129.61
  6. Step 6: Final answer
    x = 189.13

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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.