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Finding the Fourth Proportional to 1,438.31, 2,156.91 and 513.62

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Solution

The fourth proportional to 1,438.31, 2,156.91 and 513.62 is: 770.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.31 : 2,156.91 = 513.62 : x
  2. Step 2: Convert to fraction form
    1,438.31/2,156.91 = 513.62/x
  3. Step 3: Cross multiply
    1,438.31x = 2,156.91 × 513.62
  4. Step 4: Simplify right side
    1,438.31x = 1,107,821.33
  5. Step 5: Solve for x
    x = 1,107,821.33/1,438.31
  6. Step 6: Final answer
    x = 770.23

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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.