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Finding the Fourth Proportional to 679.49, 1,018.62 and 268.64

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Solution

The fourth proportional to 679.49, 1,018.62 and 268.64 is: 402.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.49 : 1,018.62 = 268.64 : x
  2. Step 2: Convert to fraction form
    679.49/1,018.62 = 268.64/x
  3. Step 3: Cross multiply
    679.49x = 1,018.62 × 268.64
  4. Step 4: Simplify right side
    679.49x = 273,642.08
  5. Step 5: Solve for x
    x = 273,642.08/679.49
  6. Step 6: Final answer
    x = 402.72

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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.