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Finding the Fourth Proportional to 990.08, 1,485.44 and 774.40

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Solution

The fourth proportional to 990.08, 1,485.44 and 774.40 is: 1,161.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.08 : 1,485.44 = 774.40 : x
  2. Step 2: Convert to fraction form
    990.08/1,485.44 = 774.40/x
  3. Step 3: Cross multiply
    990.08x = 1,485.44 × 774.40
  4. Step 4: Simplify right side
    990.08x = 1,150,324.74
  5. Step 5: Solve for x
    x = 1,150,324.74/990.08
  6. Step 6: Final answer
    x = 1,161.85

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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.