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Finding the Fourth Proportional to 1,478.73, 2,218.54 and 699.33

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Solution

The fourth proportional to 1,478.73, 2,218.54 and 699.33 is: 1,049.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.73 : 2,218.54 = 699.33 : x
  2. Step 2: Convert to fraction form
    1,478.73/2,218.54 = 699.33/x
  3. Step 3: Cross multiply
    1,478.73x = 2,218.54 × 699.33
  4. Step 4: Simplify right side
    1,478.73x = 1,551,491.58
  5. Step 5: Solve for x
    x = 1,551,491.58/1,478.73
  6. Step 6: Final answer
    x = 1,049.21

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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.