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Finding the Fourth Proportional to 809.94, 1,215.12 and 347.46

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Solution

The fourth proportional to 809.94, 1,215.12 and 347.46 is: 521.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.94 : 1,215.12 = 347.46 : x
  2. Step 2: Convert to fraction form
    809.94/1,215.12 = 347.46/x
  3. Step 3: Cross multiply
    809.94x = 1,215.12 × 347.46
  4. Step 4: Simplify right side
    809.94x = 422,205.60
  5. Step 5: Solve for x
    x = 422,205.60/809.94
  6. Step 6: Final answer
    x = 521.28

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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.