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Finding the Fourth Proportional to 57.80, 86.72 and 34.99

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Solution

The fourth proportional to 57.80, 86.72 and 34.99 is: 52.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.80 : 86.72 = 34.99 : x
  2. Step 2: Convert to fraction form
    57.80/86.72 = 34.99/x
  3. Step 3: Cross multiply
    57.80x = 86.72 × 34.99
  4. Step 4: Simplify right side
    57.80x = 3,034.33
  5. Step 5: Solve for x
    x = 3,034.33/57.80
  6. Step 6: Final answer
    x = 52.50

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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.