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Finding the Fourth Proportional to 844.02, 1,266.93 and 640.80

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Solution

The fourth proportional to 844.02, 1,266.93 and 640.80 is: 961.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    844.02 : 1,266.93 = 640.80 : x
  2. Step 2: Convert to fraction form
    844.02/1,266.93 = 640.80/x
  3. Step 3: Cross multiply
    844.02x = 1,266.93 × 640.80
  4. Step 4: Simplify right side
    844.02x = 811,848.74
  5. Step 5: Solve for x
    x = 811,848.74/844.02
  6. Step 6: Final answer
    x = 961.88

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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.