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Finding the Fourth Proportional to 679.89, 1,019.79 and 355.44

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Solution

The fourth proportional to 679.89, 1,019.79 and 355.44 is: 533.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.89 : 1,019.79 = 355.44 : x
  2. Step 2: Convert to fraction form
    679.89/1,019.79 = 355.44/x
  3. Step 3: Cross multiply
    679.89x = 1,019.79 × 355.44
  4. Step 4: Simplify right side
    679.89x = 362,474.16
  5. Step 5: Solve for x
    x = 362,474.16/679.89
  6. Step 6: Final answer
    x = 533.14

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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.