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Finding the Fourth Proportional to 679.02, 1,017.81 and 418.33

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Solution

The fourth proportional to 679.02, 1,017.81 and 418.33 is: 627.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.02 : 1,017.81 = 418.33 : x
  2. Step 2: Convert to fraction form
    679.02/1,017.81 = 418.33/x
  3. Step 3: Cross multiply
    679.02x = 1,017.81 × 418.33
  4. Step 4: Simplify right side
    679.02x = 425,780.46
  5. Step 5: Solve for x
    x = 425,780.46/679.02
  6. Step 6: Final answer
    x = 627.06

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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.