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Finding the Fourth Proportional to 619.65, 855 and 371.07

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Solution

The fourth proportional to 619.65, 855 and 371.07 is: 512.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.65 : 855 = 371.07 : x
  2. Step 2: Convert to fraction form
    619.65/855 = 371.07/x
  3. Step 3: Cross multiply
    619.65x = 855 × 371.07
  4. Step 4: Simplify right side
    619.65x = 317,264.85
  5. Step 5: Solve for x
    x = 317,264.85/619.65
  6. Step 6: Final answer
    x = 512.01

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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.