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Finding the Fourth Proportional to 878.61, 1,212.63 and 668.45

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Solution

The fourth proportional to 878.61, 1,212.63 and 668.45 is: 922.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.61 : 1,212.63 = 668.45 : x
  2. Step 2: Convert to fraction form
    878.61/1,212.63 = 668.45/x
  3. Step 3: Cross multiply
    878.61x = 1,212.63 × 668.45
  4. Step 4: Simplify right side
    878.61x = 810,582.52
  5. Step 5: Solve for x
    x = 810,582.52/878.61
  6. Step 6: Final answer
    x = 922.57

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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.