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Finding the Fourth Proportional to 878.52, 1,212.31 and 505.45

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Solution

The fourth proportional to 878.52, 1,212.31 and 505.45 is: 697.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.52 : 1,212.31 = 505.45 : x
  2. Step 2: Convert to fraction form
    878.52/1,212.31 = 505.45/x
  3. Step 3: Cross multiply
    878.52x = 1,212.31 × 505.45
  4. Step 4: Simplify right side
    878.52x = 612,762.09
  5. Step 5: Solve for x
    x = 612,762.09/878.52
  6. Step 6: Final answer
    x = 697.49

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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.