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Finding the Fourth Proportional to 77.15, 106.26 and 61.59

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Solution

The fourth proportional to 77.15, 106.26 and 61.59 is: 84.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.15 : 106.26 = 61.59 : x
  2. Step 2: Convert to fraction form
    77.15/106.26 = 61.59/x
  3. Step 3: Cross multiply
    77.15x = 106.26 × 61.59
  4. Step 4: Simplify right side
    77.15x = 6,544.17
  5. Step 5: Solve for x
    x = 6,544.17/77.15
  6. Step 6: Final answer
    x = 84.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.