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Finding the Fourth Proportional to 109.71, 151.12 and 103.09

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Solution

The fourth proportional to 109.71, 151.12 and 103.09 is: 142.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.71 : 151.12 = 103.09 : x
  2. Step 2: Convert to fraction form
    109.71/151.12 = 103.09/x
  3. Step 3: Cross multiply
    109.71x = 151.12 × 103.09
  4. Step 4: Simplify right side
    109.71x = 15,578.96
  5. Step 5: Solve for x
    x = 15,578.96/109.71
  6. Step 6: Final answer
    x = 142.00

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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.