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Finding the Fourth Proportional to 69.44, 95.40 and 65.40

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Solution

The fourth proportional to 69.44, 95.40 and 65.40 is: 89.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.44 : 95.40 = 65.40 : x
  2. Step 2: Convert to fraction form
    69.44/95.40 = 65.40/x
  3. Step 3: Cross multiply
    69.44x = 95.40 × 65.40
  4. Step 4: Simplify right side
    69.44x = 6,239.16
  5. Step 5: Solve for x
    x = 6,239.16/69.44
  6. Step 6: Final answer
    x = 89.85

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.