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Finding the Fourth Proportional to 1,504.08, 2,253.96 and 990

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Solution

The fourth proportional to 1,504.08, 2,253.96 and 990 is: 1,483.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,504.08 : 2,253.96 = 990 : x
  2. Step 2: Convert to fraction form
    1,504.08/2,253.96 = 990/x
  3. Step 3: Cross multiply
    1,504.08x = 2,253.96 × 990
  4. Step 4: Simplify right side
    1,504.08x = 2,231,420.40
  5. Step 5: Solve for x
    x = 2,231,420.40/1,504.08
  6. Step 6: Final answer
    x = 1,483.58

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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.