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Finding the Fourth Proportional to 620.11, 855.70 and 371.50

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Solution

The fourth proportional to 620.11, 855.70 and 371.50 is: 512.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.11 : 855.70 = 371.50 : x
  2. Step 2: Convert to fraction form
    620.11/855.70 = 371.50/x
  3. Step 3: Cross multiply
    620.11x = 855.70 × 371.50
  4. Step 4: Simplify right side
    620.11x = 317,892.55
  5. Step 5: Solve for x
    x = 317,892.55/620.11
  6. Step 6: Final answer
    x = 512.64

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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.