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Finding the Fourth Proportional to 878.85, 1,213.05 and 505.95

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Solution

The fourth proportional to 878.85, 1,213.05 and 505.95 is: 698.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.85 : 1,213.05 = 505.95 : x
  2. Step 2: Convert to fraction form
    878.85/1,213.05 = 505.95/x
  3. Step 3: Cross multiply
    878.85x = 1,213.05 × 505.95
  4. Step 4: Simplify right side
    878.85x = 613,742.65
  5. Step 5: Solve for x
    x = 613,742.65/878.85
  6. Step 6: Final answer
    x = 698.35

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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.