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Finding the Fourth Proportional to 56.70, 84.99 and 20.60

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Solution

The fourth proportional to 56.70, 84.99 and 20.60 is: 30.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.70 : 84.99 = 20.60 : x
  2. Step 2: Convert to fraction form
    56.70/84.99 = 20.60/x
  3. Step 3: Cross multiply
    56.70x = 84.99 × 20.60
  4. Step 4: Simplify right side
    56.70x = 1,750.79
  5. Step 5: Solve for x
    x = 1,750.79/56.70
  6. Step 6: Final answer
    x = 30.88

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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.