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Finding the Fourth Proportional to 107.72, 161.48 and 73.40

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Solution

The fourth proportional to 107.72, 161.48 and 73.40 is: 110.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.72 : 161.48 = 73.40 : x
  2. Step 2: Convert to fraction form
    107.72/161.48 = 73.40/x
  3. Step 3: Cross multiply
    107.72x = 161.48 × 73.40
  4. Step 4: Simplify right side
    107.72x = 11,852.01
  5. Step 5: Solve for x
    x = 11,852.01/107.72
  6. Step 6: Final answer
    x = 110.03

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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.