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Finding the Fourth Proportional to 1,977.74, 2,729.21 and 1,138.72

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Solution

The fourth proportional to 1,977.74, 2,729.21 and 1,138.72 is: 1,571.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,977.74 : 2,729.21 = 1,138.72 : x
  2. Step 2: Convert to fraction form
    1,977.74/2,729.21 = 1,138.72/x
  3. Step 3: Cross multiply
    1,977.74x = 2,729.21 × 1,138.72
  4. Step 4: Simplify right side
    1,977.74x = 3,107,802.03
  5. Step 5: Solve for x
    x = 3,107,802.03/1,977.74
  6. Step 6: Final answer
    x = 1,571.39

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1.5x scale

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.