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Finding the Fourth Proportional to 878.43, 1,208.59 and 667.37

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Solution

The fourth proportional to 878.43, 1,208.59 and 667.37 is: 918.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.43 : 1,208.59 = 667.37 : x
  2. Step 2: Convert to fraction form
    878.43/1,208.59 = 667.37/x
  3. Step 3: Cross multiply
    878.43x = 1,208.59 × 667.37
  4. Step 4: Simplify right side
    878.43x = 806,578.06
  5. Step 5: Solve for x
    x = 806,578.06/878.43
  6. Step 6: Final answer
    x = 918.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.