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Finding the Fourth Proportional to 77.47, 106.87 and 48.31

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Solution

The fourth proportional to 77.47, 106.87 and 48.31 is: 66.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.47 : 106.87 = 48.31 : x
  2. Step 2: Convert to fraction form
    77.47/106.87 = 48.31/x
  3. Step 3: Cross multiply
    77.47x = 106.87 × 48.31
  4. Step 4: Simplify right side
    77.47x = 5,163.04
  5. Step 5: Solve for x
    x = 5,163.04/77.47
  6. Step 6: Final answer
    x = 66.64

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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.