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Finding the Fourth Proportional to 110.78, 166.20 and 70.15

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Solution

The fourth proportional to 110.78, 166.20 and 70.15 is: 105.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.78 : 166.20 = 70.15 : x
  2. Step 2: Convert to fraction form
    110.78/166.20 = 70.15/x
  3. Step 3: Cross multiply
    110.78x = 166.20 × 70.15
  4. Step 4: Simplify right side
    110.78x = 11,658.10
  5. Step 5: Solve for x
    x = 11,658.10/110.78
  6. Step 6: Final answer
    x = 105.24

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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.