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Finding the Fourth Proportional to 717.91, 1,076.87 and 285.06

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Solution

The fourth proportional to 717.91, 1,076.87 and 285.06 is: 427.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.91 : 1,076.87 = 285.06 : x
  2. Step 2: Convert to fraction form
    717.91/1,076.87 = 285.06/x
  3. Step 3: Cross multiply
    717.91x = 1,076.87 × 285.06
  4. Step 4: Simplify right side
    717.91x = 306,975.18
  5. Step 5: Solve for x
    x = 306,975.18/717.91
  6. Step 6: Final answer
    x = 427.60

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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.