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Finding the Fourth Proportional to 40.13, 55.39 and 31.37

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Solution

The fourth proportional to 40.13, 55.39 and 31.37 is: 43.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.13 : 55.39 = 31.37 : x
  2. Step 2: Convert to fraction form
    40.13/55.39 = 31.37/x
  3. Step 3: Cross multiply
    40.13x = 55.39 × 31.37
  4. Step 4: Simplify right side
    40.13x = 1,737.51
  5. Step 5: Solve for x
    x = 1,737.51/40.13
  6. Step 6: Final answer
    x = 43.30

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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.