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Finding the Fourth Proportional to 856.98, 1,285.67 and 309.22

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Solution

The fourth proportional to 856.98, 1,285.67 and 309.22 is: 463.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.98 : 1,285.67 = 309.22 : x
  2. Step 2: Convert to fraction form
    856.98/1,285.67 = 309.22/x
  3. Step 3: Cross multiply
    856.98x = 1,285.67 × 309.22
  4. Step 4: Simplify right side
    856.98x = 397,552.44
  5. Step 5: Solve for x
    x = 397,552.44/856.98
  6. Step 6: Final answer
    x = 463.90

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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.