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Finding the Fourth Proportional to 1,438.49, 2,158.13 and 605.43

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Solution

The fourth proportional to 1,438.49, 2,158.13 and 605.43 is: 908.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.49 : 2,158.13 = 605.43 : x
  2. Step 2: Convert to fraction form
    1,438.49/2,158.13 = 605.43/x
  3. Step 3: Cross multiply
    1,438.49x = 2,158.13 × 605.43
  4. Step 4: Simplify right side
    1,438.49x = 1,306,598.16
  5. Step 5: Solve for x
    x = 1,306,598.16/1,438.49
  6. Step 6: Final answer
    x = 908.31

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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.