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Finding the Fourth Proportional to 619.63, 855.05 and 339.81

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Solution

The fourth proportional to 619.63, 855.05 and 339.81 is: 468.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.63 : 855.05 = 339.81 : x
  2. Step 2: Convert to fraction form
    619.63/855.05 = 339.81/x
  3. Step 3: Cross multiply
    619.63x = 855.05 × 339.81
  4. Step 4: Simplify right side
    619.63x = 290,554.54
  5. Step 5: Solve for x
    x = 290,554.54/619.63
  6. Step 6: Final answer
    x = 468.92

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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.