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Finding the Fourth Proportional to 1,366.40, 2,049.74 and 392.65

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Solution

The fourth proportional to 1,366.40, 2,049.74 and 392.65 is: 589.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,366.40 : 2,049.74 = 392.65 : x
  2. Step 2: Convert to fraction form
    1,366.40/2,049.74 = 392.65/x
  3. Step 3: Cross multiply
    1,366.40x = 2,049.74 × 392.65
  4. Step 4: Simplify right side
    1,366.40x = 804,824.80
  5. Step 5: Solve for x
    x = 804,824.80/1,366.40
  6. Step 6: Final answer
    x = 589.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.