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Finding the Fourth Proportional to 1,081.92, 1,622.88 and 505.20

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Solution

The fourth proportional to 1,081.92, 1,622.88 and 505.20 is: 757.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.92 : 1,622.88 = 505.20 : x
  2. Step 2: Convert to fraction form
    1,081.92/1,622.88 = 505.20/x
  3. Step 3: Cross multiply
    1,081.92x = 1,622.88 × 505.20
  4. Step 4: Simplify right side
    1,081.92x = 819,878.98
  5. Step 5: Solve for x
    x = 819,878.98/1,081.92
  6. Step 6: Final answer
    x = 757.80

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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.