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Finding the Fourth Proportional to 107.91, 161.80 and 47.03

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Solution

The fourth proportional to 107.91, 161.80 and 47.03 is: 70.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.91 : 161.80 = 47.03 : x
  2. Step 2: Convert to fraction form
    107.91/161.80 = 47.03/x
  3. Step 3: Cross multiply
    107.91x = 161.80 × 47.03
  4. Step 4: Simplify right side
    107.91x = 7,609.45
  5. Step 5: Solve for x
    x = 7,609.45/107.91
  6. Step 6: Final answer
    x = 70.52

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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.