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Finding the Fourth Proportional to 1,391.76, 1,921.95 and 1,191.42

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Solution

The fourth proportional to 1,391.76, 1,921.95 and 1,191.42 is: 1,645.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.76 : 1,921.95 = 1,191.42 : x
  2. Step 2: Convert to fraction form
    1,391.76/1,921.95 = 1,191.42/x
  3. Step 3: Cross multiply
    1,391.76x = 1,921.95 × 1,191.42
  4. Step 4: Simplify right side
    1,391.76x = 2,289,849.67
  5. Step 5: Solve for x
    x = 2,289,849.67/1,391.76
  6. Step 6: Final answer
    x = 1,645.29

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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.