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Finding the Fourth Proportional to 65.81, 98.64 and 29.21

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Solution

The fourth proportional to 65.81, 98.64 and 29.21 is: 43.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.81 : 98.64 = 29.21 : x
  2. Step 2: Convert to fraction form
    65.81/98.64 = 29.21/x
  3. Step 3: Cross multiply
    65.81x = 98.64 × 29.21
  4. Step 4: Simplify right side
    65.81x = 2,881.27
  5. Step 5: Solve for x
    x = 2,881.27/65.81
  6. Step 6: Final answer
    x = 43.78

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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.