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Finding the Fourth Proportional to 619.45, 855.01 and 370.78

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Solution

The fourth proportional to 619.45, 855.01 and 370.78 is: 511.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.45 : 855.01 = 370.78 : x
  2. Step 2: Convert to fraction form
    619.45/855.01 = 370.78/x
  3. Step 3: Cross multiply
    619.45x = 855.01 × 370.78
  4. Step 4: Simplify right side
    619.45x = 317,020.61
  5. Step 5: Solve for x
    x = 317,020.61/619.45
  6. Step 6: Final answer
    x = 511.78

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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.