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Finding the Fourth Proportional to 845.11, 1,265.90 and 679.69

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Solution

The fourth proportional to 845.11, 1,265.90 and 679.69 is: 1,018.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.11 : 1,265.90 = 679.69 : x
  2. Step 2: Convert to fraction form
    845.11/1,265.90 = 679.69/x
  3. Step 3: Cross multiply
    845.11x = 1,265.90 × 679.69
  4. Step 4: Simplify right side
    845.11x = 860,412.39
  5. Step 5: Solve for x
    x = 860,412.39/845.11
  6. Step 6: Final answer
    x = 1,018.11

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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.