Home / 2,161.69-3,243.65-928.78

Finding the Fourth Proportional to 2,161.69, 3,243.65 and 928.78

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Solution

The fourth proportional to 2,161.69, 3,243.65 and 928.78 is: 1,393.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,161.69 : 3,243.65 = 928.78 : x
  2. Step 2: Convert to fraction form
    2,161.69/3,243.65 = 928.78/x
  3. Step 3: Cross multiply
    2,161.69x = 3,243.65 × 928.78
  4. Step 4: Simplify right side
    2,161.69x = 3,012,624.49
  5. Step 5: Solve for x
    x = 3,012,624.49/2,161.69
  6. Step 6: Final answer
    x = 1,393.64

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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.