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Finding the Fourth Proportional to 40.21, 55.51 and 31.04

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Solution

The fourth proportional to 40.21, 55.51 and 31.04 is: 42.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.21 : 55.51 = 31.04 : x
  2. Step 2: Convert to fraction form
    40.21/55.51 = 31.04/x
  3. Step 3: Cross multiply
    40.21x = 55.51 × 31.04
  4. Step 4: Simplify right side
    40.21x = 1,723.19
  5. Step 5: Solve for x
    x = 1,723.19/40.21
  6. Step 6: Final answer
    x = 42.85

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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.