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Finding the Fourth Proportional to 145.72, 218.48 and 80.68

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Solution

The fourth proportional to 145.72, 218.48 and 80.68 is: 120.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.72 : 218.48 = 80.68 : x
  2. Step 2: Convert to fraction form
    145.72/218.48 = 80.68/x
  3. Step 3: Cross multiply
    145.72x = 218.48 × 80.68
  4. Step 4: Simplify right side
    145.72x = 17,626.97
  5. Step 5: Solve for x
    x = 17,626.97/145.72
  6. Step 6: Final answer
    x = 120.96

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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.