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Finding the Fourth Proportional to 619.70, 855.45 and 444.74

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Solution

The fourth proportional to 619.70, 855.45 and 444.74 is: 613.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.70 : 855.45 = 444.74 : x
  2. Step 2: Convert to fraction form
    619.70/855.45 = 444.74/x
  3. Step 3: Cross multiply
    619.70x = 855.45 × 444.74
  4. Step 4: Simplify right side
    619.70x = 380,452.83
  5. Step 5: Solve for x
    x = 380,452.83/619.70
  6. Step 6: Final answer
    x = 613.93

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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.