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Finding the Fourth Proportional to 1,438.29, 2,153.57 and 998.64

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Solution

The fourth proportional to 1,438.29, 2,153.57 and 998.64 is: 1,495.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.29 : 2,153.57 = 998.64 : x
  2. Step 2: Convert to fraction form
    1,438.29/2,153.57 = 998.64/x
  3. Step 3: Cross multiply
    1,438.29x = 2,153.57 × 998.64
  4. Step 4: Simplify right side
    1,438.29x = 2,150,636.15
  5. Step 5: Solve for x
    x = 2,150,636.15/1,438.29
  6. Step 6: Final answer
    x = 1,495.27

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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.