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Finding the Fourth Proportional to 57.40, 78.77 and 56.56

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Solution

The fourth proportional to 57.40, 78.77 and 56.56 is: 77.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.40 : 78.77 = 56.56 : x
  2. Step 2: Convert to fraction form
    57.40/78.77 = 56.56/x
  3. Step 3: Cross multiply
    57.40x = 78.77 × 56.56
  4. Step 4: Simplify right side
    57.40x = 4,455.23
  5. Step 5: Solve for x
    x = 4,455.23/57.40
  6. Step 6: Final answer
    x = 77.62

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.