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Finding the Fourth Proportional to 115.34, 172.99 and 74.09

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Solution

The fourth proportional to 115.34, 172.99 and 74.09 is: 111.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.34 : 172.99 = 74.09 : x
  2. Step 2: Convert to fraction form
    115.34/172.99 = 74.09/x
  3. Step 3: Cross multiply
    115.34x = 172.99 × 74.09
  4. Step 4: Simplify right side
    115.34x = 12,815.78
  5. Step 5: Solve for x
    x = 12,815.78/115.34
  6. Step 6: Final answer
    x = 111.11

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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.