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Finding the Fourth Proportional to 878.45, 1,212.39 and 785.69

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Solution

The fourth proportional to 878.45, 1,212.39 and 785.69 is: 1,084.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.45 : 1,212.39 = 785.69 : x
  2. Step 2: Convert to fraction form
    878.45/1,212.39 = 785.69/x
  3. Step 3: Cross multiply
    878.45x = 1,212.39 × 785.69
  4. Step 4: Simplify right side
    878.45x = 952,562.70
  5. Step 5: Solve for x
    x = 952,562.70/878.45
  6. Step 6: Final answer
    x = 1,084.37

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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.