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Finding the Fourth Proportional to 619.66, 855.84 and 471.97

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Solution

The fourth proportional to 619.66, 855.84 and 471.97 is: 651.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.66 : 855.84 = 471.97 : x
  2. Step 2: Convert to fraction form
    619.66/855.84 = 471.97/x
  3. Step 3: Cross multiply
    619.66x = 855.84 × 471.97
  4. Step 4: Simplify right side
    619.66x = 403,930.80
  5. Step 5: Solve for x
    x = 403,930.80/619.66
  6. Step 6: Final answer
    x = 651.86

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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.