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Finding the Fourth Proportional to 676.68, 1,014.54 and 420.12

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Solution

The fourth proportional to 676.68, 1,014.54 and 420.12 is: 629.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.68 : 1,014.54 = 420.12 : x
  2. Step 2: Convert to fraction form
    676.68/1,014.54 = 420.12/x
  3. Step 3: Cross multiply
    676.68x = 1,014.54 × 420.12
  4. Step 4: Simplify right side
    676.68x = 426,228.54
  5. Step 5: Solve for x
    x = 426,228.54/676.68
  6. Step 6: Final answer
    x = 629.88

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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.