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Finding the Fourth Proportional to 109.16, 161.51 and 108.86

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Solution

The fourth proportional to 109.16, 161.51 and 108.86 is: 161.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.16 : 161.51 = 108.86 : x
  2. Step 2: Convert to fraction form
    109.16/161.51 = 108.86/x
  3. Step 3: Cross multiply
    109.16x = 161.51 × 108.86
  4. Step 4: Simplify right side
    109.16x = 17,580.63
  5. Step 5: Solve for x
    x = 17,580.63/109.16
  6. Step 6: Final answer
    x = 161.06

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.