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Finding the Fourth Proportional to 57.77, 86.69 and 55.19

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Solution

The fourth proportional to 57.77, 86.69 and 55.19 is: 82.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.77 : 86.69 = 55.19 : x
  2. Step 2: Convert to fraction form
    57.77/86.69 = 55.19/x
  3. Step 3: Cross multiply
    57.77x = 86.69 × 55.19
  4. Step 4: Simplify right side
    57.77x = 4,784.42
  5. Step 5: Solve for x
    x = 4,784.42/57.77
  6. Step 6: Final answer
    x = 82.82

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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.