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Finding the Fourth Proportional to 88.38, 122.00 and 65.09

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Solution

The fourth proportional to 88.38, 122.00 and 65.09 is: 89.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.38 : 122.00 = 65.09 : x
  2. Step 2: Convert to fraction form
    88.38/122.00 = 65.09/x
  3. Step 3: Cross multiply
    88.38x = 122.00 × 65.09
  4. Step 4: Simplify right side
    88.38x = 7,940.96
  5. Step 5: Solve for x
    x = 7,940.96/88.38
  6. Step 6: Final answer
    x = 89.85

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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.