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Finding the Fourth Proportional to 1,297.67, 1,947.72 and 1,218.20

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Solution

The fourth proportional to 1,297.67, 1,947.72 and 1,218.20 is: 1,828.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.67 : 1,947.72 = 1,218.20 : x
  2. Step 2: Convert to fraction form
    1,297.67/1,947.72 = 1,218.20/x
  3. Step 3: Cross multiply
    1,297.67x = 1,947.72 × 1,218.20
  4. Step 4: Simplify right side
    1,297.67x = 2,372,712.50
  5. Step 5: Solve for x
    x = 2,372,712.50/1,297.67
  6. Step 6: Final answer
    x = 1,828.44

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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.