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Finding the Fourth Proportional to 808.14, 1,211.37 and 423.66

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Solution

The fourth proportional to 808.14, 1,211.37 and 423.66 is: 635.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.14 : 1,211.37 = 423.66 : x
  2. Step 2: Convert to fraction form
    808.14/1,211.37 = 423.66/x
  3. Step 3: Cross multiply
    808.14x = 1,211.37 × 423.66
  4. Step 4: Simplify right side
    808.14x = 513,209.01
  5. Step 5: Solve for x
    x = 513,209.01/808.14
  6. Step 6: Final answer
    x = 635.05

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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.