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Finding the Fourth Proportional to 57, 78.61 and 40.59

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Solution

The fourth proportional to 57, 78.61 and 40.59 is: 55.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    57 : 78.61 = 40.59 : x
  2. Step 2: Convert to fraction form
    57/78.61 = 40.59/x
  3. Step 3: Cross multiply
    57x = 78.61 × 40.59
  4. Step 4: Simplify right side
    57x = 3,190.78
  5. Step 5: Solve for x
    x = 3,190.78/57
  6. Step 6: Final answer
    x = 55.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.