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Finding the Fourth Proportional to 40.64, 60.84 and 28.42

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Solution

The fourth proportional to 40.64, 60.84 and 28.42 is: 42.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.64 : 60.84 = 28.42 : x
  2. Step 2: Convert to fraction form
    40.64/60.84 = 28.42/x
  3. Step 3: Cross multiply
    40.64x = 60.84 × 28.42
  4. Step 4: Simplify right side
    40.64x = 1,729.07
  5. Step 5: Solve for x
    x = 1,729.07/40.64
  6. Step 6: Final answer
    x = 42.55

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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.