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Finding the Fourth Proportional to 619.42, 854.52 and 409.30

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Solution

The fourth proportional to 619.42, 854.52 and 409.30 is: 564.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.42 : 854.52 = 409.30 : x
  2. Step 2: Convert to fraction form
    619.42/854.52 = 409.30/x
  3. Step 3: Cross multiply
    619.42x = 854.52 × 409.30
  4. Step 4: Simplify right side
    619.42x = 349,755.04
  5. Step 5: Solve for x
    x = 349,755.04/619.42
  6. Step 6: Final answer
    x = 564.65

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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.