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Finding the Fourth Proportional to 1,212.36, 1,817.74 and 442.76

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Solution

The fourth proportional to 1,212.36, 1,817.74 and 442.76 is: 663.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.36 : 1,817.74 = 442.76 : x
  2. Step 2: Convert to fraction form
    1,212.36/1,817.74 = 442.76/x
  3. Step 3: Cross multiply
    1,212.36x = 1,817.74 × 442.76
  4. Step 4: Simplify right side
    1,212.36x = 804,822.56
  5. Step 5: Solve for x
    x = 804,822.56/1,212.36
  6. Step 6: Final answer
    x = 663.85

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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.