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Finding the Fourth Proportional to 1,297.99, 1,947.21 and 648.73

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Solution

The fourth proportional to 1,297.99, 1,947.21 and 648.73 is: 973.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.99 : 1,947.21 = 648.73 : x
  2. Step 2: Convert to fraction form
    1,297.99/1,947.21 = 648.73/x
  3. Step 3: Cross multiply
    1,297.99x = 1,947.21 × 648.73
  4. Step 4: Simplify right side
    1,297.99x = 1,263,213.54
  5. Step 5: Solve for x
    x = 1,263,213.54/1,297.99
  6. Step 6: Final answer
    x = 973.21

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1.5x scale

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.