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Finding the Fourth Proportional to 1,181.38, 1,772.88 and 411.88

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Solution

The fourth proportional to 1,181.38, 1,772.88 and 411.88 is: 618.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.38 : 1,772.88 = 411.88 : x
  2. Step 2: Convert to fraction form
    1,181.38/1,772.88 = 411.88/x
  3. Step 3: Cross multiply
    1,181.38x = 1,772.88 × 411.88
  4. Step 4: Simplify right side
    1,181.38x = 730,213.81
  5. Step 5: Solve for x
    x = 730,213.81/1,181.38
  6. Step 6: Final answer
    x = 618.10

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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.