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Finding the Fourth Proportional to 106.38, 146.70 and 78.72

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Solution

The fourth proportional to 106.38, 146.70 and 78.72 is: 108.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.38 : 146.70 = 78.72 : x
  2. Step 2: Convert to fraction form
    106.38/146.70 = 78.72/x
  3. Step 3: Cross multiply
    106.38x = 146.70 × 78.72
  4. Step 4: Simplify right side
    106.38x = 11,548.22
  5. Step 5: Solve for x
    x = 11,548.22/106.38
  6. Step 6: Final answer
    x = 108.56

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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.