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Finding the Fourth Proportional to 856.08, 1,284.08 and 300.75

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Solution

The fourth proportional to 856.08, 1,284.08 and 300.75 is: 451.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.08 : 1,284.08 = 300.75 : x
  2. Step 2: Convert to fraction form
    856.08/1,284.08 = 300.75/x
  3. Step 3: Cross multiply
    856.08x = 1,284.08 × 300.75
  4. Step 4: Simplify right side
    856.08x = 386,185.56
  5. Step 5: Solve for x
    x = 386,185.56/856.08
  6. Step 6: Final answer
    x = 451.11

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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.