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Finding the Fourth Proportional to 69.72, 96.21 and 53.34

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Solution

The fourth proportional to 69.72, 96.21 and 53.34 is: 73.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.72 : 96.21 = 53.34 : x
  2. Step 2: Convert to fraction form
    69.72/96.21 = 53.34/x
  3. Step 3: Cross multiply
    69.72x = 96.21 × 53.34
  4. Step 4: Simplify right side
    69.72x = 5,131.84
  5. Step 5: Solve for x
    x = 5,131.84/69.72
  6. Step 6: Final answer
    x = 73.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.