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Finding the Fourth Proportional to 619.76, 855.50 and 423.14

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Solution

The fourth proportional to 619.76, 855.50 and 423.14 is: 584.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.76 : 855.50 = 423.14 : x
  2. Step 2: Convert to fraction form
    619.76/855.50 = 423.14/x
  3. Step 3: Cross multiply
    619.76x = 855.50 × 423.14
  4. Step 4: Simplify right side
    619.76x = 361,996.27
  5. Step 5: Solve for x
    x = 361,996.27/619.76
  6. Step 6: Final answer
    x = 584.09

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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.