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Finding the Fourth Proportional to 679.03, 1,019.91 and 659.89

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Solution

The fourth proportional to 679.03, 1,019.91 and 659.89 is: 991.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.03 : 1,019.91 = 659.89 : x
  2. Step 2: Convert to fraction form
    679.03/1,019.91 = 659.89/x
  3. Step 3: Cross multiply
    679.03x = 1,019.91 × 659.89
  4. Step 4: Simplify right side
    679.03x = 673,020.01
  5. Step 5: Solve for x
    x = 673,020.01/679.03
  6. Step 6: Final answer
    x = 991.16

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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.