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Finding the Fourth Proportional to 620.08, 855.78 and 358.12

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Solution

The fourth proportional to 620.08, 855.78 and 358.12 is: 494.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.08 : 855.78 = 358.12 : x
  2. Step 2: Convert to fraction form
    620.08/855.78 = 358.12/x
  3. Step 3: Cross multiply
    620.08x = 855.78 × 358.12
  4. Step 4: Simplify right side
    620.08x = 306,471.93
  5. Step 5: Solve for x
    x = 306,471.93/620.08
  6. Step 6: Final answer
    x = 494.25

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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.