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Finding the Fourth Proportional to 610.54, 842.21 and 400.75

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Solution

The fourth proportional to 610.54, 842.21 and 400.75 is: 552.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.54 : 842.21 = 400.75 : x
  2. Step 2: Convert to fraction form
    610.54/842.21 = 400.75/x
  3. Step 3: Cross multiply
    610.54x = 842.21 × 400.75
  4. Step 4: Simplify right side
    610.54x = 337,513.65
  5. Step 5: Solve for x
    x = 337,513.65/610.54
  6. Step 6: Final answer
    x = 552.81

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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.