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Finding the Fourth Proportional to 39.17, 54.04 and 31

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Solution

The fourth proportional to 39.17, 54.04 and 31 is: 42.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.17 : 54.04 = 31 : x
  2. Step 2: Convert to fraction form
    39.17/54.04 = 31/x
  3. Step 3: Cross multiply
    39.17x = 54.04 × 31
  4. Step 4: Simplify right side
    39.17x = 1,675.24
  5. Step 5: Solve for x
    x = 1,675.24/39.17
  6. Step 6: Final answer
    x = 42.77

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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.