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Finding the Fourth Proportional to 6,891.19, 9,509.79 and 3,747.40

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Solution

The fourth proportional to 6,891.19, 9,509.79 and 3,747.40 is: 5,171.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,891.19 : 9,509.79 = 3,747.40 : x
  2. Step 2: Convert to fraction form
    6,891.19/9,509.79 = 3,747.40/x
  3. Step 3: Cross multiply
    6,891.19x = 9,509.79 × 3,747.40
  4. Step 4: Simplify right side
    6,891.19x = 35,636,987.05
  5. Step 5: Solve for x
    x = 35,636,987.05/6,891.19
  6. Step 6: Final answer
    x = 5,171.38

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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.