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Finding the Fourth Proportional to 103.80, 155.73 and 71.51

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Solution

The fourth proportional to 103.80, 155.73 and 71.51 is: 107.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.80 : 155.73 = 71.51 : x
  2. Step 2: Convert to fraction form
    103.80/155.73 = 71.51/x
  3. Step 3: Cross multiply
    103.80x = 155.73 × 71.51
  4. Step 4: Simplify right side
    103.80x = 11,136.22
  5. Step 5: Solve for x
    x = 11,136.22/103.80
  6. Step 6: Final answer
    x = 107.28

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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.