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Finding the Fourth Proportional to 1,201.03, 1,801.11 and 420.82

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Solution

The fourth proportional to 1,201.03, 1,801.11 and 420.82 is: 631.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.03 : 1,801.11 = 420.82 : x
  2. Step 2: Convert to fraction form
    1,201.03/1,801.11 = 420.82/x
  3. Step 3: Cross multiply
    1,201.03x = 1,801.11 × 420.82
  4. Step 4: Simplify right side
    1,201.03x = 757,943.11
  5. Step 5: Solve for x
    x = 757,943.11/1,201.03
  6. Step 6: Final answer
    x = 631.08

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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.