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Finding the Fourth Proportional to 2,631.54, 3,947.68 and 782.42

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Solution

The fourth proportional to 2,631.54, 3,947.68 and 782.42 is: 1,173.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.54 : 3,947.68 = 782.42 : x
  2. Step 2: Convert to fraction form
    2,631.54/3,947.68 = 782.42/x
  3. Step 3: Cross multiply
    2,631.54x = 3,947.68 × 782.42
  4. Step 4: Simplify right side
    2,631.54x = 3,088,743.79
  5. Step 5: Solve for x
    x = 3,088,743.79/2,631.54
  6. Step 6: Final answer
    x = 1,173.74

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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.