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Finding the Fourth Proportional to 115.80, 173.70 and 97.80

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Solution

The fourth proportional to 115.80, 173.70 and 97.80 is: 146.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.80 : 173.70 = 97.80 : x
  2. Step 2: Convert to fraction form
    115.80/173.70 = 97.80/x
  3. Step 3: Cross multiply
    115.80x = 173.70 × 97.80
  4. Step 4: Simplify right side
    115.80x = 16,987.86
  5. Step 5: Solve for x
    x = 16,987.86/115.80
  6. Step 6: Final answer
    x = 146.70

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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.