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Finding the Fourth Proportional to 69.09, 94.79 and 64.95

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Solution

The fourth proportional to 69.09, 94.79 and 64.95 is: 89.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.09 : 94.79 = 64.95 : x
  2. Step 2: Convert to fraction form
    69.09/94.79 = 64.95/x
  3. Step 3: Cross multiply
    69.09x = 94.79 × 64.95
  4. Step 4: Simplify right side
    69.09x = 6,156.29
  5. Step 5: Solve for x
    x = 6,156.29/69.09
  6. Step 6: Final answer
    x = 89.11

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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.