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Finding the Fourth Proportional to 163.65, 245.34 and 90.55

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Solution

The fourth proportional to 163.65, 245.34 and 90.55 is: 135.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.65 : 245.34 = 90.55 : x
  2. Step 2: Convert to fraction form
    163.65/245.34 = 90.55/x
  3. Step 3: Cross multiply
    163.65x = 245.34 × 90.55
  4. Step 4: Simplify right side
    163.65x = 22,215.54
  5. Step 5: Solve for x
    x = 22,215.54/163.65
  6. Step 6: Final answer
    x = 135.75

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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.