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Finding the Fourth Proportional to 107.89, 161.85 and 39.40

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Solution

The fourth proportional to 107.89, 161.85 and 39.40 is: 59.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.89 : 161.85 = 39.40 : x
  2. Step 2: Convert to fraction form
    107.89/161.85 = 39.40/x
  3. Step 3: Cross multiply
    107.89x = 161.85 × 39.40
  4. Step 4: Simplify right side
    107.89x = 6,376.89
  5. Step 5: Solve for x
    x = 6,376.89/107.89
  6. Step 6: Final answer
    x = 59.11

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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.