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Finding the Fourth Proportional to 1,211.05, 1,816.73 and 420.34

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Solution

The fourth proportional to 1,211.05, 1,816.73 and 420.34 is: 630.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.05 : 1,816.73 = 420.34 : x
  2. Step 2: Convert to fraction form
    1,211.05/1,816.73 = 420.34/x
  3. Step 3: Cross multiply
    1,211.05x = 1,816.73 × 420.34
  4. Step 4: Simplify right side
    1,211.05x = 763,642.63
  5. Step 5: Solve for x
    x = 763,642.63/1,211.05
  6. Step 6: Final answer
    x = 630.56

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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.