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Finding the Fourth Proportional to 809.19, 1,212.57 and 679.59

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Solution

The fourth proportional to 809.19, 1,212.57 and 679.59 is: 1,018.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.19 : 1,212.57 = 679.59 : x
  2. Step 2: Convert to fraction form
    809.19/1,212.57 = 679.59/x
  3. Step 3: Cross multiply
    809.19x = 1,212.57 × 679.59
  4. Step 4: Simplify right side
    809.19x = 824,050.45
  5. Step 5: Solve for x
    x = 824,050.45/809.19
  6. Step 6: Final answer
    x = 1,018.36

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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.