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Finding the Fourth Proportional to 2,128.56, 3,192.57 and 830.94

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Solution

The fourth proportional to 2,128.56, 3,192.57 and 830.94 is: 1,246.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.56 : 3,192.57 = 830.94 : x
  2. Step 2: Convert to fraction form
    2,128.56/3,192.57 = 830.94/x
  3. Step 3: Cross multiply
    2,128.56x = 3,192.57 × 830.94
  4. Step 4: Simplify right side
    2,128.56x = 2,652,834.12
  5. Step 5: Solve for x
    x = 2,652,834.12/2,128.56
  6. Step 6: Final answer
    x = 1,246.30

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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.