Home / 7,121.40-9,827.34-3,891.09

Finding the Fourth Proportional to 7,121.40, 9,827.34 and 3,891.09

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Solution

The fourth proportional to 7,121.40, 9,827.34 and 3,891.09 is: 5,369.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.40 : 9,827.34 = 3,891.09 : x
  2. Step 2: Convert to fraction form
    7,121.40/9,827.34 = 3,891.09/x
  3. Step 3: Cross multiply
    7,121.40x = 9,827.34 × 3,891.09
  4. Step 4: Simplify right side
    7,121.40x = 38,239,064.40
  5. Step 5: Solve for x
    x = 38,239,064.40/7,121.40
  6. Step 6: Final answer
    x = 5,369.60

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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.