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Finding the Fourth Proportional to 1,418.41, 2,128.57 and 493.97

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Solution

The fourth proportional to 1,418.41, 2,128.57 and 493.97 is: 741.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.41 : 2,128.57 = 493.97 : x
  2. Step 2: Convert to fraction form
    1,418.41/2,128.57 = 493.97/x
  3. Step 3: Cross multiply
    1,418.41x = 2,128.57 × 493.97
  4. Step 4: Simplify right side
    1,418.41x = 1,051,449.72
  5. Step 5: Solve for x
    x = 1,051,449.72/1,418.41
  6. Step 6: Final answer
    x = 741.29

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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.