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Finding the Fourth Proportional to 103.79, 155.38 and 72.83

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Solution

The fourth proportional to 103.79, 155.38 and 72.83 is: 109.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.79 : 155.38 = 72.83 : x
  2. Step 2: Convert to fraction form
    103.79/155.38 = 72.83/x
  3. Step 3: Cross multiply
    103.79x = 155.38 × 72.83
  4. Step 4: Simplify right side
    103.79x = 11,317.00
  5. Step 5: Solve for x
    x = 11,317.00/103.79
  6. Step 6: Final answer
    x = 109.04

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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.