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Finding the Fourth Proportional to 878.94, 1,212.80 and 505.94

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Solution

The fourth proportional to 878.94, 1,212.80 and 505.94 is: 698.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.94 : 1,212.80 = 505.94 : x
  2. Step 2: Convert to fraction form
    878.94/1,212.80 = 505.94/x
  3. Step 3: Cross multiply
    878.94x = 1,212.80 × 505.94
  4. Step 4: Simplify right side
    878.94x = 613,604.03
  5. Step 5: Solve for x
    x = 613,604.03/878.94
  6. Step 6: Final answer
    x = 698.12

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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.