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Finding the Fourth Proportional to 1,011.55, 1,396.43 and 680.22

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Solution

The fourth proportional to 1,011.55, 1,396.43 and 680.22 is: 939.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.55 : 1,396.43 = 680.22 : x
  2. Step 2: Convert to fraction form
    1,011.55/1,396.43 = 680.22/x
  3. Step 3: Cross multiply
    1,011.55x = 1,396.43 × 680.22
  4. Step 4: Simplify right side
    1,011.55x = 949,879.61
  5. Step 5: Solve for x
    x = 949,879.61/1,011.55
  6. Step 6: Final answer
    x = 939.03

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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.