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Finding the Fourth Proportional to 97.75, 146.50 and 42.87

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Solution

The fourth proportional to 97.75, 146.50 and 42.87 is: 64.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.75 : 146.50 = 42.87 : x
  2. Step 2: Convert to fraction form
    97.75/146.50 = 42.87/x
  3. Step 3: Cross multiply
    97.75x = 146.50 × 42.87
  4. Step 4: Simplify right side
    97.75x = 6,280.35
  5. Step 5: Solve for x
    x = 6,280.35/97.75
  6. Step 6: Final answer
    x = 64.25

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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.