Home / 7,121.62-9,827.80-4,139.20

Finding the Fourth Proportional to 7,121.62, 9,827.80 and 4,139.20

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Solution

The fourth proportional to 7,121.62, 9,827.80 and 4,139.20 is: 5,712.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.62 : 9,827.80 = 4,139.20 : x
  2. Step 2: Convert to fraction form
    7,121.62/9,827.80 = 4,139.20/x
  3. Step 3: Cross multiply
    7,121.62x = 9,827.80 × 4,139.20
  4. Step 4: Simplify right side
    7,121.62x = 40,679,231.70
  5. Step 5: Solve for x
    x = 40,679,231.70/7,121.62
  6. Step 6: Final answer
    x = 5,712.07

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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.