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Finding the Fourth Proportional to 103.07, 154.45 and 81.46

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Solution

The fourth proportional to 103.07, 154.45 and 81.46 is: 122.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.07 : 154.45 = 81.46 : x
  2. Step 2: Convert to fraction form
    103.07/154.45 = 81.46/x
  3. Step 3: Cross multiply
    103.07x = 154.45 × 81.46
  4. Step 4: Simplify right side
    103.07x = 12,581.50
  5. Step 5: Solve for x
    x = 12,581.50/103.07
  6. Step 6: Final answer
    x = 122.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.