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Finding the Fourth Proportional to 1,438.30, 2,157 and 513.73

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Solution

The fourth proportional to 1,438.30, 2,157 and 513.73 is: 770.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.30 : 2,157 = 513.73 : x
  2. Step 2: Convert to fraction form
    1,438.30/2,157 = 513.73/x
  3. Step 3: Cross multiply
    1,438.30x = 2,157 × 513.73
  4. Step 4: Simplify right side
    1,438.30x = 1,108,115.61
  5. Step 5: Solve for x
    x = 1,108,115.61/1,438.30
  6. Step 6: Final answer
    x = 770.43

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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.