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Finding the Fourth Proportional to 809.84, 1,214.78 and 262.40

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Solution

The fourth proportional to 809.84, 1,214.78 and 262.40 is: 393.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.84 : 1,214.78 = 262.40 : x
  2. Step 2: Convert to fraction form
    809.84/1,214.78 = 262.40/x
  3. Step 3: Cross multiply
    809.84x = 1,214.78 × 262.40
  4. Step 4: Simplify right side
    809.84x = 318,758.27
  5. Step 5: Solve for x
    x = 318,758.27/809.84
  6. Step 6: Final answer
    x = 393.61

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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.