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Finding the Fourth Proportional to 38.61, 57.86 and 36.45

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Solution

The fourth proportional to 38.61, 57.86 and 36.45 is: 54.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.61 : 57.86 = 36.45 : x
  2. Step 2: Convert to fraction form
    38.61/57.86 = 36.45/x
  3. Step 3: Cross multiply
    38.61x = 57.86 × 36.45
  4. Step 4: Simplify right side
    38.61x = 2,109.16
  5. Step 5: Solve for x
    x = 2,109.16/38.61
  6. Step 6: Final answer
    x = 54.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.