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Finding the Fourth Proportional to 1,379.92, 1,903.62 and 856.12

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Solution

The fourth proportional to 1,379.92, 1,903.62 and 856.12 is: 1,181.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.92 : 1,903.62 = 856.12 : x
  2. Step 2: Convert to fraction form
    1,379.92/1,903.62 = 856.12/x
  3. Step 3: Cross multiply
    1,379.92x = 1,903.62 × 856.12
  4. Step 4: Simplify right side
    1,379.92x = 1,629,727.15
  5. Step 5: Solve for x
    x = 1,629,727.15/1,379.92
  6. Step 6: Final answer
    x = 1,181.03

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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.