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Finding the Fourth Proportional to 619.15, 854.05 and 409.33

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Solution

The fourth proportional to 619.15, 854.05 and 409.33 is: 564.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.15 : 854.05 = 409.33 : x
  2. Step 2: Convert to fraction form
    619.15/854.05 = 409.33/x
  3. Step 3: Cross multiply
    619.15x = 854.05 × 409.33
  4. Step 4: Simplify right side
    619.15x = 349,588.29
  5. Step 5: Solve for x
    x = 349,588.29/619.15
  6. Step 6: Final answer
    x = 564.63

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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.