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Finding the Fourth Proportional to 679.20, 1,018.18 and 313.75

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Solution

The fourth proportional to 679.20, 1,018.18 and 313.75 is: 470.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.20 : 1,018.18 = 313.75 : x
  2. Step 2: Convert to fraction form
    679.20/1,018.18 = 313.75/x
  3. Step 3: Cross multiply
    679.20x = 1,018.18 × 313.75
  4. Step 4: Simplify right side
    679.20x = 319,453.98
  5. Step 5: Solve for x
    x = 319,453.98/679.20
  6. Step 6: Final answer
    x = 470.34

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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.