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Finding the Fourth Proportional to 84.07, 125.81 and 51.56

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Solution

The fourth proportional to 84.07, 125.81 and 51.56 is: 77.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.07 : 125.81 = 51.56 : x
  2. Step 2: Convert to fraction form
    84.07/125.81 = 51.56/x
  3. Step 3: Cross multiply
    84.07x = 125.81 × 51.56
  4. Step 4: Simplify right side
    84.07x = 6,486.26
  5. Step 5: Solve for x
    x = 6,486.26/84.07
  6. Step 6: Final answer
    x = 77.15

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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.