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Finding the Fourth Proportional to 1,491.76, 2,058.70 and 828.68

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Solution

The fourth proportional to 1,491.76, 2,058.70 and 828.68 is: 1,143.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,491.76 : 2,058.70 = 828.68 : x
  2. Step 2: Convert to fraction form
    1,491.76/2,058.70 = 828.68/x
  3. Step 3: Cross multiply
    1,491.76x = 2,058.70 × 828.68
  4. Step 4: Simplify right side
    1,491.76x = 1,705,989.08
  5. Step 5: Solve for x
    x = 1,705,989.08/1,491.76
  6. Step 6: Final answer
    x = 1,143.61

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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.