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Finding the Fourth Proportional to 77.45, 107.06 and 62.87

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Solution

The fourth proportional to 77.45, 107.06 and 62.87 is: 86.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.45 : 107.06 = 62.87 : x
  2. Step 2: Convert to fraction form
    77.45/107.06 = 62.87/x
  3. Step 3: Cross multiply
    77.45x = 107.06 × 62.87
  4. Step 4: Simplify right side
    77.45x = 6,730.86
  5. Step 5: Solve for x
    x = 6,730.86/77.45
  6. Step 6: Final answer
    x = 86.91

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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.