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Finding the Fourth Proportional to 129, 192.40 and 115.35

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Solution

The fourth proportional to 129, 192.40 and 115.35 is: 172.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 192.40 = 115.35 : x
  2. Step 2: Convert to fraction form
    129/192.40 = 115.35/x
  3. Step 3: Cross multiply
    129x = 192.40 × 115.35
  4. Step 4: Simplify right side
    129x = 22,193.34
  5. Step 5: Solve for x
    x = 22,193.34/129
  6. Step 6: Final answer
    x = 172.04

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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.