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Finding the Fourth Proportional to 57.13, 78.84 and 56.36

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Solution

The fourth proportional to 57.13, 78.84 and 56.36 is: 77.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.13 : 78.84 = 56.36 : x
  2. Step 2: Convert to fraction form
    57.13/78.84 = 56.36/x
  3. Step 3: Cross multiply
    57.13x = 78.84 × 56.36
  4. Step 4: Simplify right side
    57.13x = 4,443.62
  5. Step 5: Solve for x
    x = 4,443.62/57.13
  6. Step 6: Final answer
    x = 77.78

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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.