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Finding the Fourth Proportional to 103.84, 143.10 and 72.74

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Solution

The fourth proportional to 103.84, 143.10 and 72.74 is: 100.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.84 : 143.10 = 72.74 : x
  2. Step 2: Convert to fraction form
    103.84/143.10 = 72.74/x
  3. Step 3: Cross multiply
    103.84x = 143.10 × 72.74
  4. Step 4: Simplify right side
    103.84x = 10,409.45
  5. Step 5: Solve for x
    x = 10,409.45/103.84
  6. Step 6: Final answer
    x = 100.25

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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.