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Finding the Fourth Proportional to 776.41, 1,071.46 and 427.09

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Solution

The fourth proportional to 776.41, 1,071.46 and 427.09 is: 589.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.41 : 1,071.46 = 427.09 : x
  2. Step 2: Convert to fraction form
    776.41/1,071.46 = 427.09/x
  3. Step 3: Cross multiply
    776.41x = 1,071.46 × 427.09
  4. Step 4: Simplify right side
    776.41x = 457,609.85
  5. Step 5: Solve for x
    x = 457,609.85/776.41
  6. Step 6: Final answer
    x = 589.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.