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Finding the Fourth Proportional to 451.68, 678.60 and 289.68

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Solution

The fourth proportional to 451.68, 678.60 and 289.68 is: 435.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.68 : 678.60 = 289.68 : x
  2. Step 2: Convert to fraction form
    451.68/678.60 = 289.68/x
  3. Step 3: Cross multiply
    451.68x = 678.60 × 289.68
  4. Step 4: Simplify right side
    451.68x = 196,576.85
  5. Step 5: Solve for x
    x = 196,576.85/451.68
  6. Step 6: Final answer
    x = 435.21

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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.