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Finding the Fourth Proportional to 1,366.40, 2,048.40 and 818.80

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Solution

The fourth proportional to 1,366.40, 2,048.40 and 818.80 is: 1,227.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,366.40 : 2,048.40 = 818.80 : x
  2. Step 2: Convert to fraction form
    1,366.40/2,048.40 = 818.80/x
  3. Step 3: Cross multiply
    1,366.40x = 2,048.40 × 818.80
  4. Step 4: Simplify right side
    1,366.40x = 1,677,229.92
  5. Step 5: Solve for x
    x = 1,677,229.92/1,366.40
  6. Step 6: Final answer
    x = 1,227.48

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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.