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Finding the Fourth Proportional to 165.88, 248.70 and 69.70

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Solution

The fourth proportional to 165.88, 248.70 and 69.70 is: 104.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.88 : 248.70 = 69.70 : x
  2. Step 2: Convert to fraction form
    165.88/248.70 = 69.70/x
  3. Step 3: Cross multiply
    165.88x = 248.70 × 69.70
  4. Step 4: Simplify right side
    165.88x = 17,334.39
  5. Step 5: Solve for x
    x = 17,334.39/165.88
  6. Step 6: Final answer
    x = 104.50

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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.