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Finding the Fourth Proportional to 39.96, 55.15 and 28.35

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Solution

The fourth proportional to 39.96, 55.15 and 28.35 is: 39.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.96 : 55.15 = 28.35 : x
  2. Step 2: Convert to fraction form
    39.96/55.15 = 28.35/x
  3. Step 3: Cross multiply
    39.96x = 55.15 × 28.35
  4. Step 4: Simplify right side
    39.96x = 1,563.43
  5. Step 5: Solve for x
    x = 1,563.43/39.96
  6. Step 6: Final answer
    x = 39.12

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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.