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Finding the Fourth Proportional to 1,491.31, 2,058.05 and 828.22

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Solution

The fourth proportional to 1,491.31, 2,058.05 and 828.22 is: 1,142.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,491.31 : 2,058.05 = 828.22 : x
  2. Step 2: Convert to fraction form
    1,491.31/2,058.05 = 828.22/x
  3. Step 3: Cross multiply
    1,491.31x = 2,058.05 × 828.22
  4. Step 4: Simplify right side
    1,491.31x = 1,704,515.10
  5. Step 5: Solve for x
    x = 1,704,515.10/1,491.31
  6. Step 6: Final answer
    x = 1,142.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.