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Finding the Fourth Proportional to 1,383.96, 2,070.75 and 861.52

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Solution

The fourth proportional to 1,383.96, 2,070.75 and 861.52 is: 1,289.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.96 : 2,070.75 = 861.52 : x
  2. Step 2: Convert to fraction form
    1,383.96/2,070.75 = 861.52/x
  3. Step 3: Cross multiply
    1,383.96x = 2,070.75 × 861.52
  4. Step 4: Simplify right side
    1,383.96x = 1,783,984.94
  5. Step 5: Solve for x
    x = 1,783,984.94/1,383.96
  6. Step 6: Final answer
    x = 1,289.04

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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.