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Finding the Fourth Proportional to 2,836.78, 4,255.17 and 784.78

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Solution

The fourth proportional to 2,836.78, 4,255.17 and 784.78 is: 1,177.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,836.78 : 4,255.17 = 784.78 : x
  2. Step 2: Convert to fraction form
    2,836.78/4,255.17 = 784.78/x
  3. Step 3: Cross multiply
    2,836.78x = 4,255.17 × 784.78
  4. Step 4: Simplify right side
    2,836.78x = 3,339,372.31
  5. Step 5: Solve for x
    x = 3,339,372.31/2,836.78
  6. Step 6: Final answer
    x = 1,177.17

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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.