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Finding the Fourth Proportional to 717.96, 1,077 and 285

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Solution

The fourth proportional to 717.96, 1,077 and 285 is: 427.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.96 : 1,077 = 285 : x
  2. Step 2: Convert to fraction form
    717.96/1,077 = 285/x
  3. Step 3: Cross multiply
    717.96x = 1,077 × 285
  4. Step 4: Simplify right side
    717.96x = 306,945
  5. Step 5: Solve for x
    x = 306,945/717.96
  6. Step 6: Final answer
    x = 427.52

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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.