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Finding the Fourth Proportional to 611.50, 842.56 and 414.66

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Solution

The fourth proportional to 611.50, 842.56 and 414.66 is: 571.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.50 : 842.56 = 414.66 : x
  2. Step 2: Convert to fraction form
    611.50/842.56 = 414.66/x
  3. Step 3: Cross multiply
    611.50x = 842.56 × 414.66
  4. Step 4: Simplify right side
    611.50x = 349,375.93
  5. Step 5: Solve for x
    x = 349,375.93/611.50
  6. Step 6: Final answer
    x = 571.34

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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.