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Finding the Fourth Proportional to 990.11, 1,485.14 and 574.26

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Solution

The fourth proportional to 990.11, 1,485.14 and 574.26 is: 861.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.11 : 1,485.14 = 574.26 : x
  2. Step 2: Convert to fraction form
    990.11/1,485.14 = 574.26/x
  3. Step 3: Cross multiply
    990.11x = 1,485.14 × 574.26
  4. Step 4: Simplify right side
    990.11x = 852,855.78
  5. Step 5: Solve for x
    x = 852,855.78/990.11
  6. Step 6: Final answer
    x = 861.38

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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.