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Finding the Fourth Proportional to 1,940.42, 2,911.14 and 553.76

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Solution

The fourth proportional to 1,940.42, 2,911.14 and 553.76 is: 830.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.42 : 2,911.14 = 553.76 : x
  2. Step 2: Convert to fraction form
    1,940.42/2,911.14 = 553.76/x
  3. Step 3: Cross multiply
    1,940.42x = 2,911.14 × 553.76
  4. Step 4: Simplify right side
    1,940.42x = 1,612,072.89
  5. Step 5: Solve for x
    x = 1,612,072.89/1,940.42
  6. Step 6: Final answer
    x = 830.79

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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.