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Finding the Fourth Proportional to 56.38, 84.07 and 55.21

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Solution

The fourth proportional to 56.38, 84.07 and 55.21 is: 82.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.38 : 84.07 = 55.21 : x
  2. Step 2: Convert to fraction form
    56.38/84.07 = 55.21/x
  3. Step 3: Cross multiply
    56.38x = 84.07 × 55.21
  4. Step 4: Simplify right side
    56.38x = 4,641.50
  5. Step 5: Solve for x
    x = 4,641.50/56.38
  6. Step 6: Final answer
    x = 82.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.