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Finding the Fourth Proportional to 679.07, 1,020.65 and 448.75

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Solution

The fourth proportional to 679.07, 1,020.65 and 448.75 is: 674.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.07 : 1,020.65 = 448.75 : x
  2. Step 2: Convert to fraction form
    679.07/1,020.65 = 448.75/x
  3. Step 3: Cross multiply
    679.07x = 1,020.65 × 448.75
  4. Step 4: Simplify right side
    679.07x = 458,012.50
  5. Step 5: Solve for x
    x = 458,012.50/679.07
  6. Step 6: Final answer
    x = 674.47

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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.