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Finding the Fourth Proportional to 163.61, 225.78 and 89.93

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Solution

The fourth proportional to 163.61, 225.78 and 89.93 is: 124.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.61 : 225.78 = 89.93 : x
  2. Step 2: Convert to fraction form
    163.61/225.78 = 89.93/x
  3. Step 3: Cross multiply
    163.61x = 225.78 × 89.93
  4. Step 4: Simplify right side
    163.61x = 20,302.82
  5. Step 5: Solve for x
    x = 20,302.82/163.61
  6. Step 6: Final answer
    x = 124.10

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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.