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Finding the Fourth Proportional to 57.76, 79.84 and 39.36

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Solution

The fourth proportional to 57.76, 79.84 and 39.36 is: 54.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.76 : 79.84 = 39.36 : x
  2. Step 2: Convert to fraction form
    57.76/79.84 = 39.36/x
  3. Step 3: Cross multiply
    57.76x = 79.84 × 39.36
  4. Step 4: Simplify right side
    57.76x = 3,142.50
  5. Step 5: Solve for x
    x = 3,142.50/57.76
  6. Step 6: Final answer
    x = 54.41

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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.