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Finding the Fourth Proportional to 109.16, 149.98 and 104.39

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Solution

The fourth proportional to 109.16, 149.98 and 104.39 is: 143.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.16 : 149.98 = 104.39 : x
  2. Step 2: Convert to fraction form
    109.16/149.98 = 104.39/x
  3. Step 3: Cross multiply
    109.16x = 149.98 × 104.39
  4. Step 4: Simplify right side
    109.16x = 15,656.41
  5. Step 5: Solve for x
    x = 15,656.41/109.16
  6. Step 6: Final answer
    x = 143.43

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.