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Finding the Fourth Proportional to 1,378.65, 1,896.90 and 1,191.54

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Solution

The fourth proportional to 1,378.65, 1,896.90 and 1,191.54 is: 1,639.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.65 : 1,896.90 = 1,191.54 : x
  2. Step 2: Convert to fraction form
    1,378.65/1,896.90 = 1,191.54/x
  3. Step 3: Cross multiply
    1,378.65x = 1,896.90 × 1,191.54
  4. Step 4: Simplify right side
    1,378.65x = 2,260,232.23
  5. Step 5: Solve for x
    x = 2,260,232.23/1,378.65
  6. Step 6: Final answer
    x = 1,639.45

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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.