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Finding the Fourth Proportional to 39.63, 54.71 and 31.44

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Solution

The fourth proportional to 39.63, 54.71 and 31.44 is: 43.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.63 : 54.71 = 31.44 : x
  2. Step 2: Convert to fraction form
    39.63/54.71 = 31.44/x
  3. Step 3: Cross multiply
    39.63x = 54.71 × 31.44
  4. Step 4: Simplify right side
    39.63x = 1,720.08
  5. Step 5: Solve for x
    x = 1,720.08/39.63
  6. Step 6: Final answer
    x = 43.40

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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.