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Finding the Fourth Proportional to 40.88, 56.31 and 34.28

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Solution

The fourth proportional to 40.88, 56.31 and 34.28 is: 47.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.88 : 56.31 = 34.28 : x
  2. Step 2: Convert to fraction form
    40.88/56.31 = 34.28/x
  3. Step 3: Cross multiply
    40.88x = 56.31 × 34.28
  4. Step 4: Simplify right side
    40.88x = 1,930.31
  5. Step 5: Solve for x
    x = 1,930.31/40.88
  6. Step 6: Final answer
    x = 47.22

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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.