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Finding the Fourth Proportional to 620.14, 928.38 and 388.33

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Solution

The fourth proportional to 620.14, 928.38 and 388.33 is: 581.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.14 : 928.38 = 388.33 : x
  2. Step 2: Convert to fraction form
    620.14/928.38 = 388.33/x
  3. Step 3: Cross multiply
    620.14x = 928.38 × 388.33
  4. Step 4: Simplify right side
    620.14x = 360,517.81
  5. Step 5: Solve for x
    x = 360,517.81/620.14
  6. Step 6: Final answer
    x = 581.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.