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Finding the Fourth Proportional to 65.76, 98.78 and 40.11

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Solution

The fourth proportional to 65.76, 98.78 and 40.11 is: 60.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.76 : 98.78 = 40.11 : x
  2. Step 2: Convert to fraction form
    65.76/98.78 = 40.11/x
  3. Step 3: Cross multiply
    65.76x = 98.78 × 40.11
  4. Step 4: Simplify right side
    65.76x = 3,961.87
  5. Step 5: Solve for x
    x = 3,961.87/65.76
  6. Step 6: Final answer
    x = 60.25

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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.