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Finding the Fourth Proportional to 109.70, 164.50 and 86.82

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Solution

The fourth proportional to 109.70, 164.50 and 86.82 is: 130.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.70 : 164.50 = 86.82 : x
  2. Step 2: Convert to fraction form
    109.70/164.50 = 86.82/x
  3. Step 3: Cross multiply
    109.70x = 164.50 × 86.82
  4. Step 4: Simplify right side
    109.70x = 14,281.89
  5. Step 5: Solve for x
    x = 14,281.89/109.70
  6. Step 6: Final answer
    x = 130.19

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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.