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Finding the Fourth Proportional to 1,660.77, 2,491.29 and 838.53

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Solution

The fourth proportional to 1,660.77, 2,491.29 and 838.53 is: 1,257.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,660.77 : 2,491.29 = 838.53 : x
  2. Step 2: Convert to fraction form
    1,660.77/2,491.29 = 838.53/x
  3. Step 3: Cross multiply
    1,660.77x = 2,491.29 × 838.53
  4. Step 4: Simplify right side
    1,660.77x = 2,089,021.40
  5. Step 5: Solve for x
    x = 2,089,021.40/1,660.77
  6. Step 6: Final answer
    x = 1,257.86

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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.