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Finding the Fourth Proportional to 620.47, 855.02 and 443.12

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Solution

The fourth proportional to 620.47, 855.02 and 443.12 is: 610.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.47 : 855.02 = 443.12 : x
  2. Step 2: Convert to fraction form
    620.47/855.02 = 443.12/x
  3. Step 3: Cross multiply
    620.47x = 855.02 × 443.12
  4. Step 4: Simplify right side
    620.47x = 378,876.46
  5. Step 5: Solve for x
    x = 378,876.46/620.47
  6. Step 6: Final answer
    x = 610.63

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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.