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Finding the Fourth Proportional to 40.33, 55.71 and 31.23

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Solution

The fourth proportional to 40.33, 55.71 and 31.23 is: 43.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.33 : 55.71 = 31.23 : x
  2. Step 2: Convert to fraction form
    40.33/55.71 = 31.23/x
  3. Step 3: Cross multiply
    40.33x = 55.71 × 31.23
  4. Step 4: Simplify right side
    40.33x = 1,739.82
  5. Step 5: Solve for x
    x = 1,739.82/40.33
  6. Step 6: Final answer
    x = 43.14

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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.