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Finding the Fourth Proportional to 619.86, 855.09 and 412.50

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Solution

The fourth proportional to 619.86, 855.09 and 412.50 is: 569.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.86 : 855.09 = 412.50 : x
  2. Step 2: Convert to fraction form
    619.86/855.09 = 412.50/x
  3. Step 3: Cross multiply
    619.86x = 855.09 × 412.50
  4. Step 4: Simplify right side
    619.86x = 352,724.63
  5. Step 5: Solve for x
    x = 352,724.63/619.86
  6. Step 6: Final answer
    x = 569.04

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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.