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Finding the Fourth Proportional to 104.09, 155.76 and 65.40

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Solution

The fourth proportional to 104.09, 155.76 and 65.40 is: 97.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.09 : 155.76 = 65.40 : x
  2. Step 2: Convert to fraction form
    104.09/155.76 = 65.40/x
  3. Step 3: Cross multiply
    104.09x = 155.76 × 65.40
  4. Step 4: Simplify right side
    104.09x = 10,185.60
  5. Step 5: Solve for x
    x = 10,185.60/104.09
  6. Step 6: Final answer
    x = 97.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.