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Finding the Fourth Proportional to 856.94, 1,284.92 and 308.90

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Solution

The fourth proportional to 856.94, 1,284.92 and 308.90 is: 463.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.94 : 1,284.92 = 308.90 : x
  2. Step 2: Convert to fraction form
    856.94/1,284.92 = 308.90/x
  3. Step 3: Cross multiply
    856.94x = 1,284.92 × 308.90
  4. Step 4: Simplify right side
    856.94x = 396,903.82
  5. Step 5: Solve for x
    x = 396,903.82/856.94
  6. Step 6: Final answer
    x = 463.17

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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.