Home / 3,287.80-4,931.70-2,121.40

Finding the Fourth Proportional to 3,287.80, 4,931.70 and 2,121.40

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Solution

The fourth proportional to 3,287.80, 4,931.70 and 2,121.40 is: 3,182.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,287.80 : 4,931.70 = 2,121.40 : x
  2. Step 2: Convert to fraction form
    3,287.80/4,931.70 = 2,121.40/x
  3. Step 3: Cross multiply
    3,287.80x = 4,931.70 × 2,121.40
  4. Step 4: Simplify right side
    3,287.80x = 10,462,108.38
  5. Step 5: Solve for x
    x = 10,462,108.38/3,287.80
  6. Step 6: Final answer
    x = 3,182.10

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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.