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Finding the Fourth Proportional to 69.92, 96.56 and 45.38

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Solution

The fourth proportional to 69.92, 96.56 and 45.38 is: 62.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.92 : 96.56 = 45.38 : x
  2. Step 2: Convert to fraction form
    69.92/96.56 = 45.38/x
  3. Step 3: Cross multiply
    69.92x = 96.56 × 45.38
  4. Step 4: Simplify right side
    69.92x = 4,381.89
  5. Step 5: Solve for x
    x = 4,381.89/69.92
  6. Step 6: Final answer
    x = 62.67

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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.