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Finding the Fourth Proportional to 69.75, 96.39 and 64.89

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Solution

The fourth proportional to 69.75, 96.39 and 64.89 is: 89.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.75 : 96.39 = 64.89 : x
  2. Step 2: Convert to fraction form
    69.75/96.39 = 64.89/x
  3. Step 3: Cross multiply
    69.75x = 96.39 × 64.89
  4. Step 4: Simplify right side
    69.75x = 6,254.75
  5. Step 5: Solve for x
    x = 6,254.75/69.75
  6. Step 6: Final answer
    x = 89.67

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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.