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Finding the Fourth Proportional to 109.43, 151.07 and 78.41

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Solution

The fourth proportional to 109.43, 151.07 and 78.41 is: 108.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.43 : 151.07 = 78.41 : x
  2. Step 2: Convert to fraction form
    109.43/151.07 = 78.41/x
  3. Step 3: Cross multiply
    109.43x = 151.07 × 78.41
  4. Step 4: Simplify right side
    109.43x = 11,845.40
  5. Step 5: Solve for x
    x = 11,845.40/109.43
  6. Step 6: Final answer
    x = 108.25

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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.