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Finding the Fourth Proportional to 984.98, 1,477.65 and 620.21

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Solution

The fourth proportional to 984.98, 1,477.65 and 620.21 is: 930.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.98 : 1,477.65 = 620.21 : x
  2. Step 2: Convert to fraction form
    984.98/1,477.65 = 620.21/x
  3. Step 3: Cross multiply
    984.98x = 1,477.65 × 620.21
  4. Step 4: Simplify right side
    984.98x = 916,453.31
  5. Step 5: Solve for x
    x = 916,453.31/984.98
  6. Step 6: Final answer
    x = 930.43

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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.