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Finding the Fourth Proportional to 45.05, 67.61 and 40.28

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Solution

The fourth proportional to 45.05, 67.61 and 40.28 is: 60.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.05 : 67.61 = 40.28 : x
  2. Step 2: Convert to fraction form
    45.05/67.61 = 40.28/x
  3. Step 3: Cross multiply
    45.05x = 67.61 × 40.28
  4. Step 4: Simplify right side
    45.05x = 2,722.79
  5. Step 5: Solve for x
    x = 2,722.79/45.05
  6. Step 6: Final answer
    x = 60.45

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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.