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Finding the Fourth Proportional to 97.40, 134.38 and 78.04

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Solution

The fourth proportional to 97.40, 134.38 and 78.04 is: 107.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.40 : 134.38 = 78.04 : x
  2. Step 2: Convert to fraction form
    97.40/134.38 = 78.04/x
  3. Step 3: Cross multiply
    97.40x = 134.38 × 78.04
  4. Step 4: Simplify right side
    97.40x = 10,487.02
  5. Step 5: Solve for x
    x = 10,487.02/97.40
  6. Step 6: Final answer
    x = 107.67

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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.