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Finding the Fourth Proportional to 990.58, 1,485.38 and 579.82

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Solution

The fourth proportional to 990.58, 1,485.38 and 579.82 is: 869.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.58 : 1,485.38 = 579.82 : x
  2. Step 2: Convert to fraction form
    990.58/1,485.38 = 579.82/x
  3. Step 3: Cross multiply
    990.58x = 1,485.38 × 579.82
  4. Step 4: Simplify right side
    990.58x = 861,253.03
  5. Step 5: Solve for x
    x = 861,253.03/990.58
  6. Step 6: Final answer
    x = 869.44

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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.