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Finding the Fourth Proportional to 111.02, 166.34 and 78.39

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Solution

The fourth proportional to 111.02, 166.34 and 78.39 is: 117.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.02 : 166.34 = 78.39 : x
  2. Step 2: Convert to fraction form
    111.02/166.34 = 78.39/x
  3. Step 3: Cross multiply
    111.02x = 166.34 × 78.39
  4. Step 4: Simplify right side
    111.02x = 13,039.59
  5. Step 5: Solve for x
    x = 13,039.59/111.02
  6. Step 6: Final answer
    x = 117.46

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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.