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Finding the Fourth Proportional to 673.42, 1,009.80 and 326.78

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Solution

The fourth proportional to 673.42, 1,009.80 and 326.78 is: 490.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.42 : 1,009.80 = 326.78 : x
  2. Step 2: Convert to fraction form
    673.42/1,009.80 = 326.78/x
  3. Step 3: Cross multiply
    673.42x = 1,009.80 × 326.78
  4. Step 4: Simplify right side
    673.42x = 329,982.44
  5. Step 5: Solve for x
    x = 329,982.44/673.42
  6. Step 6: Final answer
    x = 490.01

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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.