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Finding the Fourth Proportional to 115.65, 173.40 and 47.20

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Solution

The fourth proportional to 115.65, 173.40 and 47.20 is: 70.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.65 : 173.40 = 47.20 : x
  2. Step 2: Convert to fraction form
    115.65/173.40 = 47.20/x
  3. Step 3: Cross multiply
    115.65x = 173.40 × 47.20
  4. Step 4: Simplify right side
    115.65x = 8,183.79
  5. Step 5: Solve for x
    x = 8,183.79/115.65
  6. Step 6: Final answer
    x = 70.76

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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.