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Finding the Fourth Proportional to 878.12, 1,315.92 and 445.52

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Solution

The fourth proportional to 878.12, 1,315.92 and 445.52 is: 667.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.12 : 1,315.92 = 445.52 : x
  2. Step 2: Convert to fraction form
    878.12/1,315.92 = 445.52/x
  3. Step 3: Cross multiply
    878.12x = 1,315.92 × 445.52
  4. Step 4: Simplify right side
    878.12x = 586,268.68
  5. Step 5: Solve for x
    x = 586,268.68/878.12
  6. Step 6: Final answer
    x = 667.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.