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Finding the Fourth Proportional to 115.52, 172.86 and 72.16

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Solution

The fourth proportional to 115.52, 172.86 and 72.16 is: 107.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.52 : 172.86 = 72.16 : x
  2. Step 2: Convert to fraction form
    115.52/172.86 = 72.16/x
  3. Step 3: Cross multiply
    115.52x = 172.86 × 72.16
  4. Step 4: Simplify right side
    115.52x = 12,473.58
  5. Step 5: Solve for x
    x = 12,473.58/115.52
  6. Step 6: Final answer
    x = 107.98

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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.