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Finding the Fourth Proportional to 164.72, 247.15 and 72.20

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Solution

The fourth proportional to 164.72, 247.15 and 72.20 is: 108.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.72 : 247.15 = 72.20 : x
  2. Step 2: Convert to fraction form
    164.72/247.15 = 72.20/x
  3. Step 3: Cross multiply
    164.72x = 247.15 × 72.20
  4. Step 4: Simplify right side
    164.72x = 17,844.23
  5. Step 5: Solve for x
    x = 17,844.23/164.72
  6. Step 6: Final answer
    x = 108.33

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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.