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Finding the Fourth Proportional to 115.65, 173.24 and 72.21

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Solution

The fourth proportional to 115.65, 173.24 and 72.21 is: 108.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.65 : 173.24 = 72.21 : x
  2. Step 2: Convert to fraction form
    115.65/173.24 = 72.21/x
  3. Step 3: Cross multiply
    115.65x = 173.24 × 72.21
  4. Step 4: Simplify right side
    115.65x = 12,509.30
  5. Step 5: Solve for x
    x = 12,509.30/115.65
  6. Step 6: Final answer
    x = 108.17

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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.