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Finding the Fourth Proportional to 679.12, 1,016.61 and 447.55

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Solution

The fourth proportional to 679.12, 1,016.61 and 447.55 is: 669.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.12 : 1,016.61 = 447.55 : x
  2. Step 2: Convert to fraction form
    679.12/1,016.61 = 447.55/x
  3. Step 3: Cross multiply
    679.12x = 1,016.61 × 447.55
  4. Step 4: Simplify right side
    679.12x = 454,983.81
  5. Step 5: Solve for x
    x = 454,983.81/679.12
  6. Step 6: Final answer
    x = 669.96

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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.