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Finding the Fourth Proportional to 163.42, 245.12 and 72.09

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Solution

The fourth proportional to 163.42, 245.12 and 72.09 is: 108.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.42 : 245.12 = 72.09 : x
  2. Step 2: Convert to fraction form
    163.42/245.12 = 72.09/x
  3. Step 3: Cross multiply
    163.42x = 245.12 × 72.09
  4. Step 4: Simplify right side
    163.42x = 17,670.70
  5. Step 5: Solve for x
    x = 17,670.70/163.42
  6. Step 6: Final answer
    x = 108.13

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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.