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Finding the Fourth Proportional to 115.35, 172.86 and 61.29

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Solution

The fourth proportional to 115.35, 172.86 and 61.29 is: 91.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.35 : 172.86 = 61.29 : x
  2. Step 2: Convert to fraction form
    115.35/172.86 = 61.29/x
  3. Step 3: Cross multiply
    115.35x = 172.86 × 61.29
  4. Step 4: Simplify right side
    115.35x = 10,594.59
  5. Step 5: Solve for x
    x = 10,594.59/115.35
  6. Step 6: Final answer
    x = 91.85

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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.