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Finding the Fourth Proportional to 77.31, 106.70 and 48.20

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Solution

The fourth proportional to 77.31, 106.70 and 48.20 is: 66.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.31 : 106.70 = 48.20 : x
  2. Step 2: Convert to fraction form
    77.31/106.70 = 48.20/x
  3. Step 3: Cross multiply
    77.31x = 106.70 × 48.20
  4. Step 4: Simplify right side
    77.31x = 5,142.17
  5. Step 5: Solve for x
    x = 5,142.17/77.31
  6. Step 6: Final answer
    x = 66.51

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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.