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Finding the Fourth Proportional to 115.30, 172.91 and 38.24

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Solution

The fourth proportional to 115.30, 172.91 and 38.24 is: 57.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.30 : 172.91 = 38.24 : x
  2. Step 2: Convert to fraction form
    115.30/172.91 = 38.24/x
  3. Step 3: Cross multiply
    115.30x = 172.91 × 38.24
  4. Step 4: Simplify right side
    115.30x = 6,612.08
  5. Step 5: Solve for x
    x = 6,612.08/115.30
  6. Step 6: Final answer
    x = 57.35

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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.