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Finding the Fourth Proportional to 809.38, 1,214.08 and 648.09

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Solution

The fourth proportional to 809.38, 1,214.08 and 648.09 is: 972.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.38 : 1,214.08 = 648.09 : x
  2. Step 2: Convert to fraction form
    809.38/1,214.08 = 648.09/x
  3. Step 3: Cross multiply
    809.38x = 1,214.08 × 648.09
  4. Step 4: Simplify right side
    809.38x = 786,831.49
  5. Step 5: Solve for x
    x = 786,831.49/809.38
  6. Step 6: Final answer
    x = 972.14

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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.