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Finding the Fourth Proportional to 783.25, 1,079.85 and 673.90

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Solution

The fourth proportional to 783.25, 1,079.85 and 673.90 is: 929.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.25 : 1,079.85 = 673.90 : x
  2. Step 2: Convert to fraction form
    783.25/1,079.85 = 673.90/x
  3. Step 3: Cross multiply
    783.25x = 1,079.85 × 673.90
  4. Step 4: Simplify right side
    783.25x = 727,710.92
  5. Step 5: Solve for x
    x = 727,710.92/783.25
  6. Step 6: Final answer
    x = 929.09

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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.