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Finding the Fourth Proportional to 878.65, 1,212.04 and 559.03

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Solution

The fourth proportional to 878.65, 1,212.04 and 559.03 is: 771.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.65 : 1,212.04 = 559.03 : x
  2. Step 2: Convert to fraction form
    878.65/1,212.04 = 559.03/x
  3. Step 3: Cross multiply
    878.65x = 1,212.04 × 559.03
  4. Step 4: Simplify right side
    878.65x = 677,566.72
  5. Step 5: Solve for x
    x = 677,566.72/878.65
  6. Step 6: Final answer
    x = 771.15

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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.