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Finding the Fourth Proportional to 103.71, 143.07 and 103.25

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Solution

The fourth proportional to 103.71, 143.07 and 103.25 is: 142.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.71 : 143.07 = 103.25 : x
  2. Step 2: Convert to fraction form
    103.71/143.07 = 103.25/x
  3. Step 3: Cross multiply
    103.71x = 143.07 × 103.25
  4. Step 4: Simplify right side
    103.71x = 14,771.98
  5. Step 5: Solve for x
    x = 14,771.98/103.71
  6. Step 6: Final answer
    x = 142.44

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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.