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Finding the Fourth Proportional to 2,318.97, 3,478.46 and 856.42

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Solution

The fourth proportional to 2,318.97, 3,478.46 and 856.42 is: 1,284.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,318.97 : 3,478.46 = 856.42 : x
  2. Step 2: Convert to fraction form
    2,318.97/3,478.46 = 856.42/x
  3. Step 3: Cross multiply
    2,318.97x = 3,478.46 × 856.42
  4. Step 4: Simplify right side
    2,318.97x = 2,979,009.73
  5. Step 5: Solve for x
    x = 2,979,009.73/2,318.97
  6. Step 6: Final answer
    x = 1,284.63

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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.