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Finding the Fourth Proportional to 620.89, 930.99 and 328.09

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Solution

The fourth proportional to 620.89, 930.99 and 328.09 is: 491.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.89 : 930.99 = 328.09 : x
  2. Step 2: Convert to fraction form
    620.89/930.99 = 328.09/x
  3. Step 3: Cross multiply
    620.89x = 930.99 × 328.09
  4. Step 4: Simplify right side
    620.89x = 305,448.51
  5. Step 5: Solve for x
    x = 305,448.51/620.89
  6. Step 6: Final answer
    x = 491.95

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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.