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Finding the Fourth Proportional to 39.07, 53.62 and 36.78

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Solution

The fourth proportional to 39.07, 53.62 and 36.78 is: 50.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.07 : 53.62 = 36.78 : x
  2. Step 2: Convert to fraction form
    39.07/53.62 = 36.78/x
  3. Step 3: Cross multiply
    39.07x = 53.62 × 36.78
  4. Step 4: Simplify right side
    39.07x = 1,972.14
  5. Step 5: Solve for x
    x = 1,972.14/39.07
  6. Step 6: Final answer
    x = 50.48

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.