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Finding the Fourth Proportional to 1,299.81, 1,949.97 and 478.08

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Solution

The fourth proportional to 1,299.81, 1,949.97 and 478.08 is: 717.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.81 : 1,949.97 = 478.08 : x
  2. Step 2: Convert to fraction form
    1,299.81/1,949.97 = 478.08/x
  3. Step 3: Cross multiply
    1,299.81x = 1,949.97 × 478.08
  4. Step 4: Simplify right side
    1,299.81x = 932,241.66
  5. Step 5: Solve for x
    x = 932,241.66/1,299.81
  6. Step 6: Final answer
    x = 717.21

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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.