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Finding the Fourth Proportional to 878.87, 1,212.98 and 668.70

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Solution

The fourth proportional to 878.87, 1,212.98 and 668.70 is: 922.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.87 : 1,212.98 = 668.70 : x
  2. Step 2: Convert to fraction form
    878.87/1,212.98 = 668.70/x
  3. Step 3: Cross multiply
    878.87x = 1,212.98 × 668.70
  4. Step 4: Simplify right side
    878.87x = 811,116.38
  5. Step 5: Solve for x
    x = 811,116.38/878.87
  6. Step 6: Final answer
    x = 922.91

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1.5x scale

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.