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Finding the Fourth Proportional to 1,998.85, 2,998 and 538.09

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Solution

The fourth proportional to 1,998.85, 2,998 and 538.09 is: 807.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.85 : 2,998 = 538.09 : x
  2. Step 2: Convert to fraction form
    1,998.85/2,998 = 538.09/x
  3. Step 3: Cross multiply
    1,998.85x = 2,998 × 538.09
  4. Step 4: Simplify right side
    1,998.85x = 1,613,193.82
  5. Step 5: Solve for x
    x = 1,613,193.82/1,998.85
  6. Step 6: Final answer
    x = 807.06

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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.