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Finding the Fourth Proportional to 165.77, 228.77 and 91.09

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Solution

The fourth proportional to 165.77, 228.77 and 91.09 is: 125.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.77 : 228.77 = 91.09 : x
  2. Step 2: Convert to fraction form
    165.77/228.77 = 91.09/x
  3. Step 3: Cross multiply
    165.77x = 228.77 × 91.09
  4. Step 4: Simplify right side
    165.77x = 20,837.06
  5. Step 5: Solve for x
    x = 20,837.06/165.77
  6. Step 6: Final answer
    x = 125.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.