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Finding the Fourth Proportional to 1,999.19, 2,999.17 and 903.56

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Solution

The fourth proportional to 1,999.19, 2,999.17 and 903.56 is: 1,355.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.19 : 2,999.17 = 903.56 : x
  2. Step 2: Convert to fraction form
    1,999.19/2,999.17 = 903.56/x
  3. Step 3: Cross multiply
    1,999.19x = 2,999.17 × 903.56
  4. Step 4: Simplify right side
    1,999.19x = 2,709,913.64
  5. Step 5: Solve for x
    x = 2,709,913.64/1,999.19
  6. Step 6: Final answer
    x = 1,355.51

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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.