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Finding the Fourth Proportional to 6,891.79, 9,509.97 and 3,907.89

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Solution

The fourth proportional to 6,891.79, 9,509.97 and 3,907.89 is: 5,392.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,891.79 : 9,509.97 = 3,907.89 : x
  2. Step 2: Convert to fraction form
    6,891.79/9,509.97 = 3,907.89/x
  3. Step 3: Cross multiply
    6,891.79x = 9,509.97 × 3,907.89
  4. Step 4: Simplify right side
    6,891.79x = 37,163,916.66
  5. Step 5: Solve for x
    x = 37,163,916.66/6,891.79
  6. Step 6: Final answer
    x = 5,392.49

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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.