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Finding the Fourth Proportional to 679.59, 1,017.75 and 418.88

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Solution

The fourth proportional to 679.59, 1,017.75 and 418.88 is: 627.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.59 : 1,017.75 = 418.88 : x
  2. Step 2: Convert to fraction form
    679.59/1,017.75 = 418.88/x
  3. Step 3: Cross multiply
    679.59x = 1,017.75 × 418.88
  4. Step 4: Simplify right side
    679.59x = 426,315.12
  5. Step 5: Solve for x
    x = 426,315.12/679.59
  6. Step 6: Final answer
    x = 627.31

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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.