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Finding the Fourth Proportional to 56.70, 84.70 and 54.12

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Solution

The fourth proportional to 56.70, 84.70 and 54.12 is: 80.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.70 : 84.70 = 54.12 : x
  2. Step 2: Convert to fraction form
    56.70/84.70 = 54.12/x
  3. Step 3: Cross multiply
    56.70x = 84.70 × 54.12
  4. Step 4: Simplify right side
    56.70x = 4,583.96
  5. Step 5: Solve for x
    x = 4,583.96/56.70
  6. Step 6: Final answer
    x = 80.85

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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.