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Finding the Fourth Proportional to 803.81, 1,205.60 and 667.73

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Solution

The fourth proportional to 803.81, 1,205.60 and 667.73 is: 1,001.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.81 : 1,205.60 = 667.73 : x
  2. Step 2: Convert to fraction form
    803.81/1,205.60 = 667.73/x
  3. Step 3: Cross multiply
    803.81x = 1,205.60 × 667.73
  4. Step 4: Simplify right side
    803.81x = 805,011.95
  5. Step 5: Solve for x
    x = 805,011.95/803.81
  6. Step 6: Final answer
    x = 1,001.50

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Double scale
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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.