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Finding the Fourth Proportional to 65.87, 98.84 and 40.15

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Solution

The fourth proportional to 65.87, 98.84 and 40.15 is: 60.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.87 : 98.84 = 40.15 : x
  2. Step 2: Convert to fraction form
    65.87/98.84 = 40.15/x
  3. Step 3: Cross multiply
    65.87x = 98.84 × 40.15
  4. Step 4: Simplify right side
    65.87x = 3,968.43
  5. Step 5: Solve for x
    x = 3,968.43/65.87
  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.