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Finding the Fourth Proportional to 619.99, 855.63 and 371.49

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Solution

The fourth proportional to 619.99, 855.63 and 371.49 is: 512.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.99 : 855.63 = 371.49 : x
  2. Step 2: Convert to fraction form
    619.99/855.63 = 371.49/x
  3. Step 3: Cross multiply
    619.99x = 855.63 × 371.49
  4. Step 4: Simplify right side
    619.99x = 317,853.21
  5. Step 5: Solve for x
    x = 317,853.21/619.99
  6. Step 6: Final answer
    x = 512.67

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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.