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Finding the Fourth Proportional to 115.10, 172.74 and 84.72

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Solution

The fourth proportional to 115.10, 172.74 and 84.72 is: 127.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.10 : 172.74 = 84.72 : x
  2. Step 2: Convert to fraction form
    115.10/172.74 = 84.72/x
  3. Step 3: Cross multiply
    115.10x = 172.74 × 84.72
  4. Step 4: Simplify right side
    115.10x = 14,634.53
  5. Step 5: Solve for x
    x = 14,634.53/115.10
  6. Step 6: Final answer
    x = 127.15

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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.