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Finding the Fourth Proportional to 679.65, 1,019.46 and 314.44

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Solution

The fourth proportional to 679.65, 1,019.46 and 314.44 is: 471.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.65 : 1,019.46 = 314.44 : x
  2. Step 2: Convert to fraction form
    679.65/1,019.46 = 314.44/x
  3. Step 3: Cross multiply
    679.65x = 1,019.46 × 314.44
  4. Step 4: Simplify right side
    679.65x = 320,559.00
  5. Step 5: Solve for x
    x = 320,559.00/679.65
  6. Step 6: Final answer
    x = 471.65

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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.