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Finding the Fourth Proportional to 878.65, 1,212.74 and 505.85

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Solution

The fourth proportional to 878.65, 1,212.74 and 505.85 is: 698.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.65 : 1,212.74 = 505.85 : x
  2. Step 2: Convert to fraction form
    878.65/1,212.74 = 505.85/x
  3. Step 3: Cross multiply
    878.65x = 1,212.74 × 505.85
  4. Step 4: Simplify right side
    878.65x = 613,459.73
  5. Step 5: Solve for x
    x = 613,459.73/878.65
  6. Step 6: Final answer
    x = 698.19

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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.