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Finding the Fourth Proportional to 163.55, 225.69 and 89.87

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Solution

The fourth proportional to 163.55, 225.69 and 89.87 is: 124.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.55 : 225.69 = 89.87 : x
  2. Step 2: Convert to fraction form
    163.55/225.69 = 89.87/x
  3. Step 3: Cross multiply
    163.55x = 225.69 × 89.87
  4. Step 4: Simplify right side
    163.55x = 20,281.63
  5. Step 5: Solve for x
    x = 20,281.63/163.55
  6. Step 6: Final answer
    x = 124.01

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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.