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Finding the Fourth Proportional to 620.23, 855.89 and 423.79

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Solution

The fourth proportional to 620.23, 855.89 and 423.79 is: 584.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.23 : 855.89 = 423.79 : x
  2. Step 2: Convert to fraction form
    620.23/855.89 = 423.79/x
  3. Step 3: Cross multiply
    620.23x = 855.89 × 423.79
  4. Step 4: Simplify right side
    620.23x = 362,715.50
  5. Step 5: Solve for x
    x = 362,715.50/620.23
  6. Step 6: Final answer
    x = 584.81

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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.