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Finding the Fourth Proportional to 56.73, 78.62 and 55.65

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Solution

The fourth proportional to 56.73, 78.62 and 55.65 is: 77.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.73 : 78.62 = 55.65 : x
  2. Step 2: Convert to fraction form
    56.73/78.62 = 55.65/x
  3. Step 3: Cross multiply
    56.73x = 78.62 × 55.65
  4. Step 4: Simplify right side
    56.73x = 4,375.20
  5. Step 5: Solve for x
    x = 4,375.20/56.73
  6. Step 6: Final answer
    x = 77.12

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.