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Finding the Fourth Proportional to 679.56, 1,017 and 419.46

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Solution

The fourth proportional to 679.56, 1,017 and 419.46 is: 627.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.56 : 1,017 = 419.46 : x
  2. Step 2: Convert to fraction form
    679.56/1,017 = 419.46/x
  3. Step 3: Cross multiply
    679.56x = 1,017 × 419.46
  4. Step 4: Simplify right side
    679.56x = 426,590.82
  5. Step 5: Solve for x
    x = 426,590.82/679.56
  6. Step 6: Final answer
    x = 627.75

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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.