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Finding the Fourth Proportional to 56.82, 78.39 and 55.74

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Solution

The fourth proportional to 56.82, 78.39 and 55.74 is: 76.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.82 : 78.39 = 55.74 : x
  2. Step 2: Convert to fraction form
    56.82/78.39 = 55.74/x
  3. Step 3: Cross multiply
    56.82x = 78.39 × 55.74
  4. Step 4: Simplify right side
    56.82x = 4,369.46
  5. Step 5: Solve for x
    x = 4,369.46/56.82
  6. Step 6: Final answer
    x = 76.90

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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.