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Finding the Fourth Proportional to 69.21, 96.01 and 65.57

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Solution

The fourth proportional to 69.21, 96.01 and 65.57 is: 90.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.21 : 96.01 = 65.57 : x
  2. Step 2: Convert to fraction form
    69.21/96.01 = 65.57/x
  3. Step 3: Cross multiply
    69.21x = 96.01 × 65.57
  4. Step 4: Simplify right side
    69.21x = 6,294.73
  5. Step 5: Solve for x
    x = 6,294.73/69.21
  6. Step 6: Final answer
    x = 90.95

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.