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Finding the Fourth Proportional to 77.66, 107.21 and 46.60

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Solution

The fourth proportional to 77.66, 107.21 and 46.60 is: 64.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.66 : 107.21 = 46.60 : x
  2. Step 2: Convert to fraction form
    77.66/107.21 = 46.60/x
  3. Step 3: Cross multiply
    77.66x = 107.21 × 46.60
  4. Step 4: Simplify right side
    77.66x = 4,995.99
  5. Step 5: Solve for x
    x = 4,995.99/77.66
  6. Step 6: Final answer
    x = 64.33

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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.