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Finding the Fourth Proportional to 66.84, 100.30 and 30.77

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Solution

The fourth proportional to 66.84, 100.30 and 30.77 is: 46.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.84 : 100.30 = 30.77 : x
  2. Step 2: Convert to fraction form
    66.84/100.30 = 30.77/x
  3. Step 3: Cross multiply
    66.84x = 100.30 × 30.77
  4. Step 4: Simplify right side
    66.84x = 3,086.23
  5. Step 5: Solve for x
    x = 3,086.23/66.84
  6. Step 6: Final answer
    x = 46.17

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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.