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Finding the Fourth Proportional to 2,743.78, 4,115.73 and 988.90

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Solution

The fourth proportional to 2,743.78, 4,115.73 and 988.90 is: 1,483.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,743.78 : 4,115.73 = 988.90 : x
  2. Step 2: Convert to fraction form
    2,743.78/4,115.73 = 988.90/x
  3. Step 3: Cross multiply
    2,743.78x = 4,115.73 × 988.90
  4. Step 4: Simplify right side
    2,743.78x = 4,070,045.40
  5. Step 5: Solve for x
    x = 4,070,045.40/2,743.78
  6. Step 6: Final answer
    x = 1,483.37

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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.