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Finding the Fourth Proportional to 56, 77.22 and 39.66

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Solution

The fourth proportional to 56, 77.22 and 39.66 is: 54.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    56 : 77.22 = 39.66 : x
  2. Step 2: Convert to fraction form
    56/77.22 = 39.66/x
  3. Step 3: Cross multiply
    56x = 77.22 × 39.66
  4. Step 4: Simplify right side
    56x = 3,062.55
  5. Step 5: Solve for x
    x = 3,062.55/56
  6. Step 6: Final answer
    x = 54.69

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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.