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Finding the Fourth Proportional to 620.40, 930.60 and 235.56

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Solution

The fourth proportional to 620.40, 930.60 and 235.56 is: 353.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.40 : 930.60 = 235.56 : x
  2. Step 2: Convert to fraction form
    620.40/930.60 = 235.56/x
  3. Step 3: Cross multiply
    620.40x = 930.60 × 235.56
  4. Step 4: Simplify right side
    620.40x = 219,212.14
  5. Step 5: Solve for x
    x = 219,212.14/620.40
  6. Step 6: Final answer
    x = 353.34

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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.