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Finding the Fourth Proportional to 56.65, 84.99 and 20.58

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Solution

The fourth proportional to 56.65, 84.99 and 20.58 is: 30.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.65 : 84.99 = 20.58 : x
  2. Step 2: Convert to fraction form
    56.65/84.99 = 20.58/x
  3. Step 3: Cross multiply
    56.65x = 84.99 × 20.58
  4. Step 4: Simplify right side
    56.65x = 1,748.86
  5. Step 5: Solve for x
    x = 1,748.86/56.65
  6. Step 6: Final answer
    x = 30.87

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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.