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Finding the Fourth Proportional to 783.56, 1,078.98 and 672.86

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Solution

The fourth proportional to 783.56, 1,078.98 and 672.86 is: 926.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.56 : 1,078.98 = 672.86 : x
  2. Step 2: Convert to fraction form
    783.56/1,078.98 = 672.86/x
  3. Step 3: Cross multiply
    783.56x = 1,078.98 × 672.86
  4. Step 4: Simplify right side
    783.56x = 726,002.48
  5. Step 5: Solve for x
    x = 726,002.48/783.56
  6. Step 6: Final answer
    x = 926.54

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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.