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Finding the Fourth Proportional to 884.20, 1,220.90 and 569.64

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Solution

The fourth proportional to 884.20, 1,220.90 and 569.64 is: 786.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.20 : 1,220.90 = 569.64 : x
  2. Step 2: Convert to fraction form
    884.20/1,220.90 = 569.64/x
  3. Step 3: Cross multiply
    884.20x = 1,220.90 × 569.64
  4. Step 4: Simplify right side
    884.20x = 695,473.48
  5. Step 5: Solve for x
    x = 695,473.48/884.20
  6. Step 6: Final answer
    x = 786.56

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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.