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Finding the Fourth Proportional to 109.08, 162.81 and 100.31

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Solution

The fourth proportional to 109.08, 162.81 and 100.31 is: 149.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.08 : 162.81 = 100.31 : x
  2. Step 2: Convert to fraction form
    109.08/162.81 = 100.31/x
  3. Step 3: Cross multiply
    109.08x = 162.81 × 100.31
  4. Step 4: Simplify right side
    109.08x = 16,330.66
  5. Step 5: Solve for x
    x = 16,330.66/109.08
  6. Step 6: Final answer
    x = 149.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.