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Finding the Fourth Proportional to 883.20, 1,219.55 and 789.78

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Solution

The fourth proportional to 883.20, 1,219.55 and 789.78 is: 1,090.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.20 : 1,219.55 = 789.78 : x
  2. Step 2: Convert to fraction form
    883.20/1,219.55 = 789.78/x
  3. Step 3: Cross multiply
    883.20x = 1,219.55 × 789.78
  4. Step 4: Simplify right side
    883.20x = 963,172.25
  5. Step 5: Solve for x
    x = 963,172.25/883.20
  6. Step 6: Final answer
    x = 1,090.55

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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.