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Finding the Fourth Proportional to 65.81, 98.21 and 64.27

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Solution

The fourth proportional to 65.81, 98.21 and 64.27 is: 95.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.81 : 98.21 = 64.27 : x
  2. Step 2: Convert to fraction form
    65.81/98.21 = 64.27/x
  3. Step 3: Cross multiply
    65.81x = 98.21 × 64.27
  4. Step 4: Simplify right side
    65.81x = 6,312.12
  5. Step 5: Solve for x
    x = 6,312.12/65.81
  6. Step 6: Final answer
    x = 95.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.