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Finding the Fourth Proportional to 40.50, 60.75 and 13.45

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Solution

The fourth proportional to 40.50, 60.75 and 13.45 is: 20.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.50 : 60.75 = 13.45 : x
  2. Step 2: Convert to fraction form
    40.50/60.75 = 13.45/x
  3. Step 3: Cross multiply
    40.50x = 60.75 × 13.45
  4. Step 4: Simplify right side
    40.50x = 817.09
  5. Step 5: Solve for x
    x = 817.09/40.50
  6. Step 6: Final answer
    x = 20.18

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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.