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Finding the Fourth Proportional to 84.12, 126.18 and 56.87

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Solution

The fourth proportional to 84.12, 126.18 and 56.87 is: 85.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.12 : 126.18 = 56.87 : x
  2. Step 2: Convert to fraction form
    84.12/126.18 = 56.87/x
  3. Step 3: Cross multiply
    84.12x = 126.18 × 56.87
  4. Step 4: Simplify right side
    84.12x = 7,175.86
  5. Step 5: Solve for x
    x = 7,175.86/84.12
  6. Step 6: Final answer
    x = 85.31

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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.