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Finding the Fourth Proportional to 57.61, 85.79 and 56.80

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Solution

The fourth proportional to 57.61, 85.79 and 56.80 is: 84.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.61 : 85.79 = 56.80 : x
  2. Step 2: Convert to fraction form
    57.61/85.79 = 56.80/x
  3. Step 3: Cross multiply
    57.61x = 85.79 × 56.80
  4. Step 4: Simplify right side
    57.61x = 4,873.12
  5. Step 5: Solve for x
    x = 4,873.12/57.61
  6. Step 6: Final answer
    x = 84.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.