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Finding the Fourth Proportional to 109.47, 163.99 and 55.31

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Solution

The fourth proportional to 109.47, 163.99 and 55.31 is: 82.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.47 : 163.99 = 55.31 : x
  2. Step 2: Convert to fraction form
    109.47/163.99 = 55.31/x
  3. Step 3: Cross multiply
    109.47x = 163.99 × 55.31
  4. Step 4: Simplify right side
    109.47x = 9,070.01
  5. Step 5: Solve for x
    x = 9,070.01/109.47
  6. Step 6: Final answer
    x = 82.85

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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.