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Finding the Fourth Proportional to 808.94, 1,213.61 and 261.11

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Solution

The fourth proportional to 808.94, 1,213.61 and 261.11 is: 391.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.94 : 1,213.61 = 261.11 : x
  2. Step 2: Convert to fraction form
    808.94/1,213.61 = 261.11/x
  3. Step 3: Cross multiply
    808.94x = 1,213.61 × 261.11
  4. Step 4: Simplify right side
    808.94x = 316,885.71
  5. Step 5: Solve for x
    x = 316,885.71/808.94
  6. Step 6: Final answer
    x = 391.73

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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.