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Finding the Fourth Proportional to 809.12, 1,214.76 and 480.67

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Solution

The fourth proportional to 809.12, 1,214.76 and 480.67 is: 721.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.12 : 1,214.76 = 480.67 : x
  2. Step 2: Convert to fraction form
    809.12/1,214.76 = 480.67/x
  3. Step 3: Cross multiply
    809.12x = 1,214.76 × 480.67
  4. Step 4: Simplify right side
    809.12x = 583,898.69
  5. Step 5: Solve for x
    x = 583,898.69/809.12
  6. Step 6: Final answer
    x = 721.65

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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.