Home / 2,128.05-2,938.17-1,331.70

Finding the Fourth Proportional to 2,128.05, 2,938.17 and 1,331.70

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Solution

The fourth proportional to 2,128.05, 2,938.17 and 1,331.70 is: 1,838.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.05 : 2,938.17 = 1,331.70 : x
  2. Step 2: Convert to fraction form
    2,128.05/2,938.17 = 1,331.70/x
  3. Step 3: Cross multiply
    2,128.05x = 2,938.17 × 1,331.70
  4. Step 4: Simplify right side
    2,128.05x = 3,912,760.99
  5. Step 5: Solve for x
    x = 3,912,760.99/2,128.05
  6. Step 6: Final answer
    x = 1,838.66

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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.