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Finding the Fourth Proportional to 77.61, 107.21 and 59.23

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Solution

The fourth proportional to 77.61, 107.21 and 59.23 is: 81.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.61 : 107.21 = 59.23 : x
  2. Step 2: Convert to fraction form
    77.61/107.21 = 59.23/x
  3. Step 3: Cross multiply
    77.61x = 107.21 × 59.23
  4. Step 4: Simplify right side
    77.61x = 6,349.48
  5. Step 5: Solve for x
    x = 6,349.48/77.61
  6. Step 6: Final answer
    x = 81.81

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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.