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Finding the Fourth Proportional to 1,478.21, 2,039.90 and 806.02

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Solution

The fourth proportional to 1,478.21, 2,039.90 and 806.02 is: 1,112.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.21 : 2,039.90 = 806.02 : x
  2. Step 2: Convert to fraction form
    1,478.21/2,039.90 = 806.02/x
  3. Step 3: Cross multiply
    1,478.21x = 2,039.90 × 806.02
  4. Step 4: Simplify right side
    1,478.21x = 1,644,197.11
  5. Step 5: Solve for x
    x = 1,644,197.11/1,478.21
  6. Step 6: Final answer
    x = 1,112.29

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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.