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Finding the Fourth Proportional to 940.20, 1,408.68 and 452.58

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Solution

The fourth proportional to 940.20, 1,408.68 and 452.58 is: 678.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.20 : 1,408.68 = 452.58 : x
  2. Step 2: Convert to fraction form
    940.20/1,408.68 = 452.58/x
  3. Step 3: Cross multiply
    940.20x = 1,408.68 × 452.58
  4. Step 4: Simplify right side
    940.20x = 637,540.39
  5. Step 5: Solve for x
    x = 637,540.39/940.20
  6. Step 6: Final answer
    x = 678.09

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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.