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Finding the Fourth Proportional to 39.57, 54.64 and 30.35

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Solution

The fourth proportional to 39.57, 54.64 and 30.35 is: 41.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.57 : 54.64 = 30.35 : x
  2. Step 2: Convert to fraction form
    39.57/54.64 = 30.35/x
  3. Step 3: Cross multiply
    39.57x = 54.64 × 30.35
  4. Step 4: Simplify right side
    39.57x = 1,657.97
  5. Step 5: Solve for x
    x = 1,657.97/39.57
  6. Step 6: Final answer
    x = 41.90

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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.