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Finding the Fourth Proportional to 129.51, 193.10 and 121.77

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Solution

The fourth proportional to 129.51, 193.10 and 121.77 is: 181.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.51 : 193.10 = 121.77 : x
  2. Step 2: Convert to fraction form
    129.51/193.10 = 121.77/x
  3. Step 3: Cross multiply
    129.51x = 193.10 × 121.77
  4. Step 4: Simplify right side
    129.51x = 23,513.18
  5. Step 5: Solve for x
    x = 23,513.18/129.51
  6. Step 6: Final answer
    x = 181.55

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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.