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Finding the Fourth Proportional to 619.61, 855.09 and 354.09

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Solution

The fourth proportional to 619.61, 855.09 and 354.09 is: 488.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.61 : 855.09 = 354.09 : x
  2. Step 2: Convert to fraction form
    619.61/855.09 = 354.09/x
  3. Step 3: Cross multiply
    619.61x = 855.09 × 354.09
  4. Step 4: Simplify right side
    619.61x = 302,780.70
  5. Step 5: Solve for x
    x = 302,780.70/619.61
  6. Step 6: Final answer
    x = 488.66

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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.