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Finding the Fourth Proportional to 77.63, 107.15 and 48.51

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Solution

The fourth proportional to 77.63, 107.15 and 48.51 is: 66.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.63 : 107.15 = 48.51 : x
  2. Step 2: Convert to fraction form
    77.63/107.15 = 48.51/x
  3. Step 3: Cross multiply
    77.63x = 107.15 × 48.51
  4. Step 4: Simplify right side
    77.63x = 5,197.60
  5. Step 5: Solve for x
    x = 5,197.60/77.63
  6. Step 6: Final answer
    x = 66.96

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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.