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Finding the Fourth Proportional to 610.78, 911.75 and 569.80

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Solution

The fourth proportional to 610.78, 911.75 and 569.80 is: 850.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.78 : 911.75 = 569.80 : x
  2. Step 2: Convert to fraction form
    610.78/911.75 = 569.80/x
  3. Step 3: Cross multiply
    610.78x = 911.75 × 569.80
  4. Step 4: Simplify right side
    610.78x = 519,515.15
  5. Step 5: Solve for x
    x = 519,515.15/610.78
  6. Step 6: Final answer
    x = 850.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.