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Finding the Fourth Proportional to 782.26, 1,078.82 and 649.27

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Solution

The fourth proportional to 782.26, 1,078.82 and 649.27 is: 895.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.26 : 1,078.82 = 649.27 : x
  2. Step 2: Convert to fraction form
    782.26/1,078.82 = 649.27/x
  3. Step 3: Cross multiply
    782.26x = 1,078.82 × 649.27
  4. Step 4: Simplify right side
    782.26x = 700,445.46
  5. Step 5: Solve for x
    x = 700,445.46/782.26
  6. Step 6: Final answer
    x = 895.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.