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Finding the Fourth Proportional to 163.69, 225.90 and 90.02

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Solution

The fourth proportional to 163.69, 225.90 and 90.02 is: 124.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.69 : 225.90 = 90.02 : x
  2. Step 2: Convert to fraction form
    163.69/225.90 = 90.02/x
  3. Step 3: Cross multiply
    163.69x = 225.90 × 90.02
  4. Step 4: Simplify right side
    163.69x = 20,334.16
  5. Step 5: Solve for x
    x = 20,334.16/163.69
  6. Step 6: Final answer
    x = 124.22

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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.