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Finding the Fourth Proportional to 39.77, 54.87 and 23.40

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Solution

The fourth proportional to 39.77, 54.87 and 23.40 is: 32.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.77 : 54.87 = 23.40 : x
  2. Step 2: Convert to fraction form
    39.77/54.87 = 23.40/x
  3. Step 3: Cross multiply
    39.77x = 54.87 × 23.40
  4. Step 4: Simplify right side
    39.77x = 1,283.78
  5. Step 5: Solve for x
    x = 1,283.78/39.77
  6. Step 6: Final answer
    x = 32.28

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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.