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Finding the Fourth Proportional to 103.06, 154.18 and 66.81

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Solution

The fourth proportional to 103.06, 154.18 and 66.81 is: 99.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.06 : 154.18 = 66.81 : x
  2. Step 2: Convert to fraction form
    103.06/154.18 = 66.81/x
  3. Step 3: Cross multiply
    103.06x = 154.18 × 66.81
  4. Step 4: Simplify right side
    103.06x = 10,300.77
  5. Step 5: Solve for x
    x = 10,300.77/103.06
  6. Step 6: Final answer
    x = 99.95

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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.