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Finding the Fourth Proportional to 620.93, 855.65 and 443.58

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Solution

The fourth proportional to 620.93, 855.65 and 443.58 is: 611.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.93 : 855.65 = 443.58 : x
  2. Step 2: Convert to fraction form
    620.93/855.65 = 443.58/x
  3. Step 3: Cross multiply
    620.93x = 855.65 × 443.58
  4. Step 4: Simplify right side
    620.93x = 379,544.63
  5. Step 5: Solve for x
    x = 379,544.63/620.93
  6. Step 6: Final answer
    x = 611.25

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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.