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Finding the Fourth Proportional to 1,391.72, 1,919.14 and 1,193.25

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Solution

The fourth proportional to 1,391.72, 1,919.14 and 1,193.25 is: 1,645.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.72 : 1,919.14 = 1,193.25 : x
  2. Step 2: Convert to fraction form
    1,391.72/1,919.14 = 1,193.25/x
  3. Step 3: Cross multiply
    1,391.72x = 1,919.14 × 1,193.25
  4. Step 4: Simplify right side
    1,391.72x = 2,290,013.94
  5. Step 5: Solve for x
    x = 2,290,013.94/1,391.72
  6. Step 6: Final answer
    x = 1,645.46

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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.