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Finding the Fourth Proportional to 1,212.45, 1,817.45 and 663.51

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Solution

The fourth proportional to 1,212.45, 1,817.45 and 663.51 is: 994.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.45 : 1,817.45 = 663.51 : x
  2. Step 2: Convert to fraction form
    1,212.45/1,817.45 = 663.51/x
  3. Step 3: Cross multiply
    1,212.45x = 1,817.45 × 663.51
  4. Step 4: Simplify right side
    1,212.45x = 1,205,892.93
  5. Step 5: Solve for x
    x = 1,205,892.93/1,212.45
  6. Step 6: Final answer
    x = 994.59

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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.