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Finding the Fourth Proportional to 103.83, 155.15 and 74.80

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Solution

The fourth proportional to 103.83, 155.15 and 74.80 is: 111.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.83 : 155.15 = 74.80 : x
  2. Step 2: Convert to fraction form
    103.83/155.15 = 74.80/x
  3. Step 3: Cross multiply
    103.83x = 155.15 × 74.80
  4. Step 4: Simplify right side
    103.83x = 11,605.22
  5. Step 5: Solve for x
    x = 11,605.22/103.83
  6. Step 6: Final answer
    x = 111.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.