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Finding the Fourth Proportional to 809.85, 1,214.52 and 261.93

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Solution

The fourth proportional to 809.85, 1,214.52 and 261.93 is: 392.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.85 : 1,214.52 = 261.93 : x
  2. Step 2: Convert to fraction form
    809.85/1,214.52 = 261.93/x
  3. Step 3: Cross multiply
    809.85x = 1,214.52 × 261.93
  4. Step 4: Simplify right side
    809.85x = 318,119.22
  5. Step 5: Solve for x
    x = 318,119.22/809.85
  6. Step 6: Final answer
    x = 392.81

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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.