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Finding the Fourth Proportional to 878.91, 1,212.80 and 568.41

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Solution

The fourth proportional to 878.91, 1,212.80 and 568.41 is: 784.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.91 : 1,212.80 = 568.41 : x
  2. Step 2: Convert to fraction form
    878.91/1,212.80 = 568.41/x
  3. Step 3: Cross multiply
    878.91x = 1,212.80 × 568.41
  4. Step 4: Simplify right side
    878.91x = 689,367.65
  5. Step 5: Solve for x
    x = 689,367.65/878.91
  6. Step 6: Final answer
    x = 784.34

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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.