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Finding the Fourth Proportional to 165.30, 247.78 and 111.21

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Solution

The fourth proportional to 165.30, 247.78 and 111.21 is: 166.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.30 : 247.78 = 111.21 : x
  2. Step 2: Convert to fraction form
    165.30/247.78 = 111.21/x
  3. Step 3: Cross multiply
    165.30x = 247.78 × 111.21
  4. Step 4: Simplify right side
    165.30x = 27,555.61
  5. Step 5: Solve for x
    x = 27,555.61/165.30
  6. Step 6: Final answer
    x = 166.70

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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.