Home / 3,981.40-5,966.70-2,661.40

Finding the Fourth Proportional to 3,981.40, 5,966.70 and 2,661.40

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Solution

The fourth proportional to 3,981.40, 5,966.70 and 2,661.40 is: 3,988.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,981.40 : 5,966.70 = 2,661.40 : x
  2. Step 2: Convert to fraction form
    3,981.40/5,966.70 = 2,661.40/x
  3. Step 3: Cross multiply
    3,981.40x = 5,966.70 × 2,661.40
  4. Step 4: Simplify right side
    3,981.40x = 15,879,775.38
  5. Step 5: Solve for x
    x = 15,879,775.38/3,981.40
  6. Step 6: Final answer
    x = 3,988.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.