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Finding the Fourth Proportional to 57.40, 86.65 and 56.80

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Solution

The fourth proportional to 57.40, 86.65 and 56.80 is: 85.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.40 : 86.65 = 56.80 : x
  2. Step 2: Convert to fraction form
    57.40/86.65 = 56.80/x
  3. Step 3: Cross multiply
    57.40x = 86.65 × 56.80
  4. Step 4: Simplify right side
    57.40x = 4,921.72
  5. Step 5: Solve for x
    x = 4,921.72/57.40
  6. Step 6: Final answer
    x = 85.74

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These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.