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Finding the Fourth Proportional to 809.71, 1,214.74 and 261.88

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Solution

The fourth proportional to 809.71, 1,214.74 and 261.88 is: 392.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.71 : 1,214.74 = 261.88 : x
  2. Step 2: Convert to fraction form
    809.71/1,214.74 = 261.88/x
  3. Step 3: Cross multiply
    809.71x = 1,214.74 × 261.88
  4. Step 4: Simplify right side
    809.71x = 318,113.40
  5. Step 5: Solve for x
    x = 318,113.40/809.71
  6. Step 6: Final answer
    x = 392.87

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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.