Home / 7,121.79-9,826.40-4,135.83

Finding the Fourth Proportional to 7,121.79, 9,826.40 and 4,135.83

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Solution

The fourth proportional to 7,121.79, 9,826.40 and 4,135.83 is: 5,706.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.79 : 9,826.40 = 4,135.83 : x
  2. Step 2: Convert to fraction form
    7,121.79/9,826.40 = 4,135.83/x
  3. Step 3: Cross multiply
    7,121.79x = 9,826.40 × 4,135.83
  4. Step 4: Simplify right side
    7,121.79x = 40,640,299.23
  5. Step 5: Solve for x
    x = 40,640,299.23/7,121.79
  6. Step 6: Final answer
    x = 5,706.47

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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.