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Finding the Fourth Proportional to 84.05, 126 and 51.51

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Solution

The fourth proportional to 84.05, 126 and 51.51 is: 77.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.05 : 126 = 51.51 : x
  2. Step 2: Convert to fraction form
    84.05/126 = 51.51/x
  3. Step 3: Cross multiply
    84.05x = 126 × 51.51
  4. Step 4: Simplify right side
    84.05x = 6,490.26
  5. Step 5: Solve for x
    x = 6,490.26/84.05
  6. Step 6: Final answer
    x = 77.22

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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.