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Finding the Fourth Proportional to 115.18, 172.85 and 79.04

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Solution

The fourth proportional to 115.18, 172.85 and 79.04 is: 118.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.18 : 172.85 = 79.04 : x
  2. Step 2: Convert to fraction form
    115.18/172.85 = 79.04/x
  3. Step 3: Cross multiply
    115.18x = 172.85 × 79.04
  4. Step 4: Simplify right side
    115.18x = 13,662.10
  5. Step 5: Solve for x
    x = 13,662.10/115.18
  6. Step 6: Final answer
    x = 118.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.