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Finding the Fourth Proportional to 2,907.78, 4,013.55 and 1,788.90

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Solution

The fourth proportional to 2,907.78, 4,013.55 and 1,788.90 is: 2,469.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,907.78 : 4,013.55 = 1,788.90 : x
  2. Step 2: Convert to fraction form
    2,907.78/4,013.55 = 1,788.90/x
  3. Step 3: Cross multiply
    2,907.78x = 4,013.55 × 1,788.90
  4. Step 4: Simplify right side
    2,907.78x = 7,179,839.60
  5. Step 5: Solve for x
    x = 7,179,839.60/2,907.78
  6. Step 6: Final answer
    x = 2,469.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.