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Finding the Fourth Proportional to 163.71, 245.50 and 69.89

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Solution

The fourth proportional to 163.71, 245.50 and 69.89 is: 104.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.71 : 245.50 = 69.89 : x
  2. Step 2: Convert to fraction form
    163.71/245.50 = 69.89/x
  3. Step 3: Cross multiply
    163.71x = 245.50 × 69.89
  4. Step 4: Simplify right side
    163.71x = 17,156.59
  5. Step 5: Solve for x
    x = 17,156.59/163.71
  6. Step 6: Final answer
    x = 104.80

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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.