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Finding the Fourth Proportional to 56.31, 77.67 and 36.90

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Solution

The fourth proportional to 56.31, 77.67 and 36.90 is: 50.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.31 : 77.67 = 36.90 : x
  2. Step 2: Convert to fraction form
    56.31/77.67 = 36.90/x
  3. Step 3: Cross multiply
    56.31x = 77.67 × 36.90
  4. Step 4: Simplify right side
    56.31x = 2,866.02
  5. Step 5: Solve for x
    x = 2,866.02/56.31
  6. Step 6: Final answer
    x = 50.90

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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.