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Finding the Fourth Proportional to 679.91, 1,018.85 and 506.30

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Solution

The fourth proportional to 679.91, 1,018.85 and 506.30 is: 758.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.91 : 1,018.85 = 506.30 : x
  2. Step 2: Convert to fraction form
    679.91/1,018.85 = 506.30/x
  3. Step 3: Cross multiply
    679.91x = 1,018.85 × 506.30
  4. Step 4: Simplify right side
    679.91x = 515,836.13
  5. Step 5: Solve for x
    x = 515,836.13/679.91
  6. Step 6: Final answer
    x = 758.69

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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.