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Finding the Fourth Proportional to 56, 84.16 and 38.90

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Solution

The fourth proportional to 56, 84.16 and 38.90 is: 58.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    56 : 84.16 = 38.90 : x
  2. Step 2: Convert to fraction form
    56/84.16 = 38.90/x
  3. Step 3: Cross multiply
    56x = 84.16 × 38.90
  4. Step 4: Simplify right side
    56x = 3,273.82
  5. Step 5: Solve for x
    x = 3,273.82/56
  6. Step 6: Final answer
    x = 58.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.