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Finding the Fourth Proportional to 678.87, 1,018.08 and 267.90

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Solution

The fourth proportional to 678.87, 1,018.08 and 267.90 is: 401.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.87 : 1,018.08 = 267.90 : x
  2. Step 2: Convert to fraction form
    678.87/1,018.08 = 267.90/x
  3. Step 3: Cross multiply
    678.87x = 1,018.08 × 267.90
  4. Step 4: Simplify right side
    678.87x = 272,743.63
  5. Step 5: Solve for x
    x = 272,743.63/678.87
  6. Step 6: Final answer
    x = 401.76

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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.