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Finding the Fourth Proportional to 809.67, 1,215.50 and 688.67

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Solution

The fourth proportional to 809.67, 1,215.50 and 688.67 is: 1,033.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.67 : 1,215.50 = 688.67 : x
  2. Step 2: Convert to fraction form
    809.67/1,215.50 = 688.67/x
  3. Step 3: Cross multiply
    809.67x = 1,215.50 × 688.67
  4. Step 4: Simplify right side
    809.67x = 837,078.39
  5. Step 5: Solve for x
    x = 837,078.39/809.67
  6. Step 6: Final answer
    x = 1,033.85

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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.