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Finding the Fourth Proportional to 3,785.50, 5,223.99 and 2,129.50

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Solution

The fourth proportional to 3,785.50, 5,223.99 and 2,129.50 is: 2,938.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,785.50 : 5,223.99 = 2,129.50 : x
  2. Step 2: Convert to fraction form
    3,785.50/5,223.99 = 2,129.50/x
  3. Step 3: Cross multiply
    3,785.50x = 5,223.99 × 2,129.50
  4. Step 4: Simplify right side
    3,785.50x = 11,124,486.71
  5. Step 5: Solve for x
    x = 11,124,486.71/3,785.50
  6. Step 6: Final answer
    x = 2,938.71

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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.