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Finding the Fourth Proportional to 57.54, 78.89 and 56.57

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Solution

The fourth proportional to 57.54, 78.89 and 56.57 is: 77.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.54 : 78.89 = 56.57 : x
  2. Step 2: Convert to fraction form
    57.54/78.89 = 56.57/x
  3. Step 3: Cross multiply
    57.54x = 78.89 × 56.57
  4. Step 4: Simplify right side
    57.54x = 4,462.13
  5. Step 5: Solve for x
    x = 4,462.13/57.54
  6. Step 6: Final answer
    x = 77.55

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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.