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Finding the Fourth Proportional to 103.68, 155.39 and 71.28

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Solution

The fourth proportional to 103.68, 155.39 and 71.28 is: 106.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.68 : 155.39 = 71.28 : x
  2. Step 2: Convert to fraction form
    103.68/155.39 = 71.28/x
  3. Step 3: Cross multiply
    103.68x = 155.39 × 71.28
  4. Step 4: Simplify right side
    103.68x = 11,075.84
  5. Step 5: Solve for x
    x = 11,075.84/103.68
  6. Step 6: Final answer
    x = 106.83

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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.