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Finding the Fourth Proportional to 70.08, 103.92 and 69.16

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Solution

The fourth proportional to 70.08, 103.92 and 69.16 is: 102.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.08 : 103.92 = 69.16 : x
  2. Step 2: Convert to fraction form
    70.08/103.92 = 69.16/x
  3. Step 3: Cross multiply
    70.08x = 103.92 × 69.16
  4. Step 4: Simplify right side
    70.08x = 7,187.11
  5. Step 5: Solve for x
    x = 7,187.11/70.08
  6. Step 6: Final answer
    x = 102.56

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.