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Finding the Fourth Proportional to 103.89, 155.66 and 73.31

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Solution

The fourth proportional to 103.89, 155.66 and 73.31 is: 109.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.89 : 155.66 = 73.31 : x
  2. Step 2: Convert to fraction form
    103.89/155.66 = 73.31/x
  3. Step 3: Cross multiply
    103.89x = 155.66 × 73.31
  4. Step 4: Simplify right side
    103.89x = 11,411.42
  5. Step 5: Solve for x
    x = 11,411.42/103.89
  6. Step 6: Final answer
    x = 109.84

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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.