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Finding the Fourth Proportional to 872.13, 1,308.38 and 409.91

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Solution

The fourth proportional to 872.13, 1,308.38 and 409.91 is: 614.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.13 : 1,308.38 = 409.91 : x
  2. Step 2: Convert to fraction form
    872.13/1,308.38 = 409.91/x
  3. Step 3: Cross multiply
    872.13x = 1,308.38 × 409.91
  4. Step 4: Simplify right side
    872.13x = 536,317.44
  5. Step 5: Solve for x
    x = 536,317.44/872.13
  6. Step 6: Final answer
    x = 614.95

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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.