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Finding the Fourth Proportional to 77.89, 107.46 and 58.51

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Solution

The fourth proportional to 77.89, 107.46 and 58.51 is: 80.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.89 : 107.46 = 58.51 : x
  2. Step 2: Convert to fraction form
    77.89/107.46 = 58.51/x
  3. Step 3: Cross multiply
    77.89x = 107.46 × 58.51
  4. Step 4: Simplify right side
    77.89x = 6,287.48
  5. Step 5: Solve for x
    x = 6,287.48/77.89
  6. Step 6: Final answer
    x = 80.72

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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.