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Finding the Fourth Proportional to 163.59, 225.74 and 89.90

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Solution

The fourth proportional to 163.59, 225.74 and 89.90 is: 124.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.59 : 225.74 = 89.90 : x
  2. Step 2: Convert to fraction form
    163.59/225.74 = 89.90/x
  3. Step 3: Cross multiply
    163.59x = 225.74 × 89.90
  4. Step 4: Simplify right side
    163.59x = 20,293.12
  5. Step 5: Solve for x
    x = 20,293.12/163.59
  6. Step 6: Final answer
    x = 124.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.