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Finding the Fourth Proportional to 990.75, 1,485.06 and 939.48

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Solution

The fourth proportional to 990.75, 1,485.06 and 939.48 is: 1,408.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.75 : 1,485.06 = 939.48 : x
  2. Step 2: Convert to fraction form
    990.75/1,485.06 = 939.48/x
  3. Step 3: Cross multiply
    990.75x = 1,485.06 × 939.48
  4. Step 4: Simplify right side
    990.75x = 1,395,184.17
  5. Step 5: Solve for x
    x = 1,395,184.17/990.75
  6. Step 6: Final answer
    x = 1,408.21

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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.