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Finding the Fourth Proportional to 679.32, 1,018.62 and 418.68

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Solution

The fourth proportional to 679.32, 1,018.62 and 418.68 is: 627.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.32 : 1,018.62 = 418.68 : x
  2. Step 2: Convert to fraction form
    679.32/1,018.62 = 418.68/x
  3. Step 3: Cross multiply
    679.32x = 1,018.62 × 418.68
  4. Step 4: Simplify right side
    679.32x = 426,475.82
  5. Step 5: Solve for x
    x = 426,475.82/679.32
  6. Step 6: Final answer
    x = 627.80

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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.