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Finding the Fourth Proportional to 1,491.74, 2,058.51 and 828.55

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Solution

The fourth proportional to 1,491.74, 2,058.51 and 828.55 is: 1,143.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,491.74 : 2,058.51 = 828.55 : x
  2. Step 2: Convert to fraction form
    1,491.74/2,058.51 = 828.55/x
  3. Step 3: Cross multiply
    1,491.74x = 2,058.51 × 828.55
  4. Step 4: Simplify right side
    1,491.74x = 1,705,578.46
  5. Step 5: Solve for x
    x = 1,705,578.46/1,491.74
  6. Step 6: Final answer
    x = 1,143.35

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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.