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Finding the Fourth Proportional to 1,212.45, 1,817.07 and 554.41

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Solution

The fourth proportional to 1,212.45, 1,817.07 and 554.41 is: 830.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.45 : 1,817.07 = 554.41 : x
  2. Step 2: Convert to fraction form
    1,212.45/1,817.07 = 554.41/x
  3. Step 3: Cross multiply
    1,212.45x = 1,817.07 × 554.41
  4. Step 4: Simplify right side
    1,212.45x = 1,007,401.78
  5. Step 5: Solve for x
    x = 1,007,401.78/1,212.45
  6. Step 6: Final answer
    x = 830.88

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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.