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Finding the Fourth Proportional to 165.76, 248.70 and 69.50

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Solution

The fourth proportional to 165.76, 248.70 and 69.50 is: 104.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.76 : 248.70 = 69.50 : x
  2. Step 2: Convert to fraction form
    165.76/248.70 = 69.50/x
  3. Step 3: Cross multiply
    165.76x = 248.70 × 69.50
  4. Step 4: Simplify right side
    165.76x = 17,284.65
  5. Step 5: Solve for x
    x = 17,284.65/165.76
  6. Step 6: Final answer
    x = 104.28

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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.