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Finding the Fourth Proportional to 1,438.43, 2,158.10 and 513.97

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Solution

The fourth proportional to 1,438.43, 2,158.10 and 513.97 is: 771.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.43 : 2,158.10 = 513.97 : x
  2. Step 2: Convert to fraction form
    1,438.43/2,158.10 = 513.97/x
  3. Step 3: Cross multiply
    1,438.43x = 2,158.10 × 513.97
  4. Step 4: Simplify right side
    1,438.43x = 1,109,197.89
  5. Step 5: Solve for x
    x = 1,109,197.89/1,438.43
  6. Step 6: Final answer
    x = 771.12

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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.