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Finding the Fourth Proportional to 679.07, 1,018.47 and 267.79

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Solution

The fourth proportional to 679.07, 1,018.47 and 267.79 is: 401.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.07 : 1,018.47 = 267.79 : x
  2. Step 2: Convert to fraction form
    679.07/1,018.47 = 267.79/x
  3. Step 3: Cross multiply
    679.07x = 1,018.47 × 267.79
  4. Step 4: Simplify right side
    679.07x = 272,740.75
  5. Step 5: Solve for x
    x = 272,740.75/679.07
  6. Step 6: Final answer
    x = 401.64

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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.