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Finding the Fourth Proportional to 989.92, 1,485.08 and 412.84

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Solution

The fourth proportional to 989.92, 1,485.08 and 412.84 is: 619.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.92 : 1,485.08 = 412.84 : x
  2. Step 2: Convert to fraction form
    989.92/1,485.08 = 412.84/x
  3. Step 3: Cross multiply
    989.92x = 1,485.08 × 412.84
  4. Step 4: Simplify right side
    989.92x = 613,100.43
  5. Step 5: Solve for x
    x = 613,100.43/989.92
  6. Step 6: Final answer
    x = 619.34

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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.