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Finding the Fourth Proportional to 103.84, 155.80 and 91.90

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Solution

The fourth proportional to 103.84, 155.80 and 91.90 is: 137.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.84 : 155.80 = 91.90 : x
  2. Step 2: Convert to fraction form
    103.84/155.80 = 91.90/x
  3. Step 3: Cross multiply
    103.84x = 155.80 × 91.90
  4. Step 4: Simplify right side
    103.84x = 14,318.02
  5. Step 5: Solve for x
    x = 14,318.02/103.84
  6. Step 6: Final answer
    x = 137.89

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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.