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Finding the Fourth Proportional to 679.73, 1,018.31 and 419.04

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Solution

The fourth proportional to 679.73, 1,018.31 and 419.04 is: 627.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.73 : 1,018.31 = 419.04 : x
  2. Step 2: Convert to fraction form
    679.73/1,018.31 = 419.04/x
  3. Step 3: Cross multiply
    679.73x = 1,018.31 × 419.04
  4. Step 4: Simplify right side
    679.73x = 426,710.53
  5. Step 5: Solve for x
    x = 426,710.53/679.73
  6. Step 6: Final answer
    x = 627.77

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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.