Home / 1,638.05-2,260.39-974.78

Finding the Fourth Proportional to 1,638.05, 2,260.39 and 974.78

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Solution

The fourth proportional to 1,638.05, 2,260.39 and 974.78 is: 1,345.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.05 : 2,260.39 = 974.78 : x
  2. Step 2: Convert to fraction form
    1,638.05/2,260.39 = 974.78/x
  3. Step 3: Cross multiply
    1,638.05x = 2,260.39 × 974.78
  4. Step 4: Simplify right side
    1,638.05x = 2,203,379.53
  5. Step 5: Solve for x
    x = 2,203,379.53/1,638.05
  6. Step 6: Final answer
    x = 1,345.12

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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.