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Finding the Fourth Proportional to 1,281.70, 1,922.55 and 623.44

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Solution

The fourth proportional to 1,281.70, 1,922.55 and 623.44 is: 935.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.70 : 1,922.55 = 623.44 : x
  2. Step 2: Convert to fraction form
    1,281.70/1,922.55 = 623.44/x
  3. Step 3: Cross multiply
    1,281.70x = 1,922.55 × 623.44
  4. Step 4: Simplify right side
    1,281.70x = 1,198,594.57
  5. Step 5: Solve for x
    x = 1,198,594.57/1,281.70
  6. Step 6: Final answer
    x = 935.16

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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.