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Finding the Fourth Proportional to 808.59, 1,213.25 and 423.75

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Solution

The fourth proportional to 808.59, 1,213.25 and 423.75 is: 635.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.59 : 1,213.25 = 423.75 : x
  2. Step 2: Convert to fraction form
    808.59/1,213.25 = 423.75/x
  3. Step 3: Cross multiply
    808.59x = 1,213.25 × 423.75
  4. Step 4: Simplify right side
    808.59x = 514,112.57
  5. Step 5: Solve for x
    x = 514,112.57/808.59
  6. Step 6: Final answer
    x = 635.81

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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.