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Finding the Fourth Proportional to 856.31, 1,285.20 and 336.68

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Solution

The fourth proportional to 856.31, 1,285.20 and 336.68 is: 505.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.31 : 1,285.20 = 336.68 : x
  2. Step 2: Convert to fraction form
    856.31/1,285.20 = 336.68/x
  3. Step 3: Cross multiply
    856.31x = 1,285.20 × 336.68
  4. Step 4: Simplify right side
    856.31x = 432,694.97
  5. Step 5: Solve for x
    x = 432,694.97/856.31
  6. Step 6: Final answer
    x = 505.30

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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.