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Finding the Fourth Proportional to 165.85, 228.93 and 103.72

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Solution

The fourth proportional to 165.85, 228.93 and 103.72 is: 143.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.85 : 228.93 = 103.72 : x
  2. Step 2: Convert to fraction form
    165.85/228.93 = 103.72/x
  3. Step 3: Cross multiply
    165.85x = 228.93 × 103.72
  4. Step 4: Simplify right side
    165.85x = 23,744.62
  5. Step 5: Solve for x
    x = 23,744.62/165.85
  6. Step 6: Final answer
    x = 143.17

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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.