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Finding the Fourth Proportional to 619.67, 855.20 and 339.96

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Solution

The fourth proportional to 619.67, 855.20 and 339.96 is: 469.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.67 : 855.20 = 339.96 : x
  2. Step 2: Convert to fraction form
    619.67/855.20 = 339.96/x
  3. Step 3: Cross multiply
    619.67x = 855.20 × 339.96
  4. Step 4: Simplify right side
    619.67x = 290,737.26
  5. Step 5: Solve for x
    x = 290,737.26/619.67
  6. Step 6: Final answer
    x = 469.18

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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.