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Finding the Fourth Proportional to 2,679.72, 4,020.46 and 947.96

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Solution

The fourth proportional to 2,679.72, 4,020.46 and 947.96 is: 1,422.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,679.72 : 4,020.46 = 947.96 : x
  2. Step 2: Convert to fraction form
    2,679.72/4,020.46 = 947.96/x
  3. Step 3: Cross multiply
    2,679.72x = 4,020.46 × 947.96
  4. Step 4: Simplify right side
    2,679.72x = 3,811,235.26
  5. Step 5: Solve for x
    x = 3,811,235.26/2,679.72
  6. Step 6: Final answer
    x = 1,422.25

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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.