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Finding the Fourth Proportional to 620.18, 855.90 and 423.96

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Solution

The fourth proportional to 620.18, 855.90 and 423.96 is: 585.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.18 : 855.90 = 423.96 : x
  2. Step 2: Convert to fraction form
    620.18/855.90 = 423.96/x
  3. Step 3: Cross multiply
    620.18x = 855.90 × 423.96
  4. Step 4: Simplify right side
    620.18x = 362,867.36
  5. Step 5: Solve for x
    x = 362,867.36/620.18
  6. Step 6: Final answer
    x = 585.10

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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.