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Finding the Fourth Proportional to 2,631.36, 3,947.76 and 782.44

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Solution

The fourth proportional to 2,631.36, 3,947.76 and 782.44 is: 1,173.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.36 : 3,947.76 = 782.44 : x
  2. Step 2: Convert to fraction form
    2,631.36/3,947.76 = 782.44/x
  3. Step 3: Cross multiply
    2,631.36x = 3,947.76 × 782.44
  4. Step 4: Simplify right side
    2,631.36x = 3,088,885.33
  5. Step 5: Solve for x
    x = 3,088,885.33/2,631.36
  6. Step 6: Final answer
    x = 1,173.87

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1.5x scale

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.