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Finding the Fourth Proportional to 56.87, 78.45 and 36.11

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Solution

The fourth proportional to 56.87, 78.45 and 36.11 is: 49.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.87 : 78.45 = 36.11 : x
  2. Step 2: Convert to fraction form
    56.87/78.45 = 36.11/x
  3. Step 3: Cross multiply
    56.87x = 78.45 × 36.11
  4. Step 4: Simplify right side
    56.87x = 2,832.65
  5. Step 5: Solve for x
    x = 2,832.65/56.87
  6. Step 6: Final answer
    x = 49.81

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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.