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Finding the Fourth Proportional to 2,630.99, 3,947.16 and 782.09

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Solution

The fourth proportional to 2,630.99, 3,947.16 and 782.09 is: 1,173.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,630.99 : 3,947.16 = 782.09 : x
  2. Step 2: Convert to fraction form
    2,630.99/3,947.16 = 782.09/x
  3. Step 3: Cross multiply
    2,630.99x = 3,947.16 × 782.09
  4. Step 4: Simplify right side
    2,630.99x = 3,087,034.36
  5. Step 5: Solve for x
    x = 3,087,034.36/2,630.99
  6. Step 6: Final answer
    x = 1,173.34

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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.