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Finding the Fourth Proportional to 856.79, 1,285.41 and 336.83

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Solution

The fourth proportional to 856.79, 1,285.41 and 336.83 is: 505.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.79 : 1,285.41 = 336.83 : x
  2. Step 2: Convert to fraction form
    856.79/1,285.41 = 336.83/x
  3. Step 3: Cross multiply
    856.79x = 1,285.41 × 336.83
  4. Step 4: Simplify right side
    856.79x = 432,958.22
  5. Step 5: Solve for x
    x = 432,958.22/856.79
  6. Step 6: Final answer
    x = 505.33

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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.