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Finding the Fourth Proportional to 109.86, 165.06 and 103.72

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Solution

The fourth proportional to 109.86, 165.06 and 103.72 is: 155.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.86 : 165.06 = 103.72 : x
  2. Step 2: Convert to fraction form
    109.86/165.06 = 103.72/x
  3. Step 3: Cross multiply
    109.86x = 165.06 × 103.72
  4. Step 4: Simplify right side
    109.86x = 17,120.02
  5. Step 5: Solve for x
    x = 17,120.02/109.86
  6. Step 6: Final answer
    x = 155.83

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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.