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Finding the Fourth Proportional to 163.81, 245.70 and 154.78

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Solution

The fourth proportional to 163.81, 245.70 and 154.78 is: 232.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.81 : 245.70 = 154.78 : x
  2. Step 2: Convert to fraction form
    163.81/245.70 = 154.78/x
  3. Step 3: Cross multiply
    163.81x = 245.70 × 154.78
  4. Step 4: Simplify right side
    163.81x = 38,028.83
  5. Step 5: Solve for x
    x = 38,028.83/163.81
  6. Step 6: Final answer
    x = 232.15

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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.