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Finding the Fourth Proportional to 109.67, 164.38 and 86.89

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Solution

The fourth proportional to 109.67, 164.38 and 86.89 is: 130.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.67 : 164.38 = 86.89 : x
  2. Step 2: Convert to fraction form
    109.67/164.38 = 86.89/x
  3. Step 3: Cross multiply
    109.67x = 164.38 × 86.89
  4. Step 4: Simplify right side
    109.67x = 14,282.98
  5. Step 5: Solve for x
    x = 14,282.98/109.67
  6. Step 6: Final answer
    x = 130.24

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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.