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Finding the Fourth Proportional to 57.72, 79.99 and 55.59

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Solution

The fourth proportional to 57.72, 79.99 and 55.59 is: 77.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.72 : 79.99 = 55.59 : x
  2. Step 2: Convert to fraction form
    57.72/79.99 = 55.59/x
  3. Step 3: Cross multiply
    57.72x = 79.99 × 55.59
  4. Step 4: Simplify right side
    57.72x = 4,446.37
  5. Step 5: Solve for x
    x = 4,446.37/57.72
  6. Step 6: Final answer
    x = 77.03

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.