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Finding the Fourth Proportional to 6,891.51, 9,509.88 and 3,908.07

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Solution

The fourth proportional to 6,891.51, 9,509.88 and 3,908.07 is: 5,392.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,891.51 : 9,509.88 = 3,908.07 : x
  2. Step 2: Convert to fraction form
    6,891.51/9,509.88 = 3,908.07/x
  3. Step 3: Cross multiply
    6,891.51x = 9,509.88 × 3,908.07
  4. Step 4: Simplify right side
    6,891.51x = 37,165,276.73
  5. Step 5: Solve for x
    x = 37,165,276.73/6,891.51
  6. Step 6: Final answer
    x = 5,392.91

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1.5x scale

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.