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Finding the Fourth Proportional to 165.77, 248.69 and 84.70

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Solution

The fourth proportional to 165.77, 248.69 and 84.70 is: 127.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.77 : 248.69 = 84.70 : x
  2. Step 2: Convert to fraction form
    165.77/248.69 = 84.70/x
  3. Step 3: Cross multiply
    165.77x = 248.69 × 84.70
  4. Step 4: Simplify right side
    165.77x = 21,064.04
  5. Step 5: Solve for x
    x = 21,064.04/165.77
  6. Step 6: Final answer
    x = 127.07

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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.