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Finding the Fourth Proportional to 678.96, 1,018.44 and 332.64

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Solution

The fourth proportional to 678.96, 1,018.44 and 332.64 is: 498.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.96 : 1,018.44 = 332.64 : x
  2. Step 2: Convert to fraction form
    678.96/1,018.44 = 332.64/x
  3. Step 3: Cross multiply
    678.96x = 1,018.44 × 332.64
  4. Step 4: Simplify right side
    678.96x = 338,773.88
  5. Step 5: Solve for x
    x = 338,773.88/678.96
  6. Step 6: Final answer
    x = 498.96

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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.