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Finding the Fourth Proportional to 40.68, 56.16 and 28.42

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Solution

The fourth proportional to 40.68, 56.16 and 28.42 is: 39.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.68 : 56.16 = 28.42 : x
  2. Step 2: Convert to fraction form
    40.68/56.16 = 28.42/x
  3. Step 3: Cross multiply
    40.68x = 56.16 × 28.42
  4. Step 4: Simplify right side
    40.68x = 1,596.07
  5. Step 5: Solve for x
    x = 1,596.07/40.68
  6. Step 6: Final answer
    x = 39.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.