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Finding the Fourth Proportional to 1,201.12, 1,801.12 and 623.84

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Solution

The fourth proportional to 1,201.12, 1,801.12 and 623.84 is: 935.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.12 : 1,801.12 = 623.84 : x
  2. Step 2: Convert to fraction form
    1,201.12/1,801.12 = 623.84/x
  3. Step 3: Cross multiply
    1,201.12x = 1,801.12 × 623.84
  4. Step 4: Simplify right side
    1,201.12x = 1,123,610.70
  5. Step 5: Solve for x
    x = 1,123,610.70/1,201.12
  6. Step 6: Final answer
    x = 935.47

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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.