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Finding the Fourth Proportional to 1,138.33, 1,570.90 and 641.15

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Solution

The fourth proportional to 1,138.33, 1,570.90 and 641.15 is: 884.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.33 : 1,570.90 = 641.15 : x
  2. Step 2: Convert to fraction form
    1,138.33/1,570.90 = 641.15/x
  3. Step 3: Cross multiply
    1,138.33x = 1,570.90 × 641.15
  4. Step 4: Simplify right side
    1,138.33x = 1,007,174.68
  5. Step 5: Solve for x
    x = 1,007,174.68/1,138.33
  6. Step 6: Final answer
    x = 884.79

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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.