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Finding the Fourth Proportional to 165.15, 247.66 and 72.56

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Solution

The fourth proportional to 165.15, 247.66 and 72.56 is: 108.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.15 : 247.66 = 72.56 : x
  2. Step 2: Convert to fraction form
    165.15/247.66 = 72.56/x
  3. Step 3: Cross multiply
    165.15x = 247.66 × 72.56
  4. Step 4: Simplify right side
    165.15x = 17,970.65
  5. Step 5: Solve for x
    x = 17,970.65/165.15
  6. Step 6: Final answer
    x = 108.81

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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.