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Finding the Fourth Proportional to 620.09, 855.51 and 354.34

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Solution

The fourth proportional to 620.09, 855.51 and 354.34 is: 488.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.09 : 855.51 = 354.34 : x
  2. Step 2: Convert to fraction form
    620.09/855.51 = 354.34/x
  3. Step 3: Cross multiply
    620.09x = 855.51 × 354.34
  4. Step 4: Simplify right side
    620.09x = 303,139.64
  5. Step 5: Solve for x
    x = 303,139.64/620.09
  6. Step 6: Final answer
    x = 488.86

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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.