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Finding the Fourth Proportional to 856.37, 1,285.16 and 773.75

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Solution

The fourth proportional to 856.37, 1,285.16 and 773.75 is: 1,161.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.37 : 1,285.16 = 773.75 : x
  2. Step 2: Convert to fraction form
    856.37/1,285.16 = 773.75/x
  3. Step 3: Cross multiply
    856.37x = 1,285.16 × 773.75
  4. Step 4: Simplify right side
    856.37x = 994,392.88
  5. Step 5: Solve for x
    x = 994,392.88/856.37
  6. Step 6: Final answer
    x = 1,161.17

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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.