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Finding the Fourth Proportional to 974.21, 1,461.36 and 426.38

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Solution

The fourth proportional to 974.21, 1,461.36 and 426.38 is: 639.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.21 : 1,461.36 = 426.38 : x
  2. Step 2: Convert to fraction form
    974.21/1,461.36 = 426.38/x
  3. Step 3: Cross multiply
    974.21x = 1,461.36 × 426.38
  4. Step 4: Simplify right side
    974.21x = 623,087.37
  5. Step 5: Solve for x
    x = 623,087.37/974.21
  6. Step 6: Final answer
    x = 639.59

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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.