Home / 7,121.69-9,828.15-3,977.81

Finding the Fourth Proportional to 7,121.69, 9,828.15 and 3,977.81

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Solution

The fourth proportional to 7,121.69, 9,828.15 and 3,977.81 is: 5,489.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.69 : 9,828.15 = 3,977.81 : x
  2. Step 2: Convert to fraction form
    7,121.69/9,828.15 = 3,977.81/x
  3. Step 3: Cross multiply
    7,121.69x = 9,828.15 × 3,977.81
  4. Step 4: Simplify right side
    7,121.69x = 39,094,523.01
  5. Step 5: Solve for x
    x = 39,094,523.01/7,121.69
  6. Step 6: Final answer
    x = 5,489.50

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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.