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Finding the Fourth Proportional to 103.22, 143.01 and 100.72

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Solution

The fourth proportional to 103.22, 143.01 and 100.72 is: 139.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.22 : 143.01 = 100.72 : x
  2. Step 2: Convert to fraction form
    103.22/143.01 = 100.72/x
  3. Step 3: Cross multiply
    103.22x = 143.01 × 100.72
  4. Step 4: Simplify right side
    103.22x = 14,402.75
  5. Step 5: Solve for x
    x = 14,402.75/103.22
  6. Step 6: Final answer
    x = 139.53

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.