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Finding the Fourth Proportional to 1,425.34, 2,137.80 and 451.31

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Solution

The fourth proportional to 1,425.34, 2,137.80 and 451.31 is: 676.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.34 : 2,137.80 = 451.31 : x
  2. Step 2: Convert to fraction form
    1,425.34/2,137.80 = 451.31/x
  3. Step 3: Cross multiply
    1,425.34x = 2,137.80 × 451.31
  4. Step 4: Simplify right side
    1,425.34x = 964,815.86
  5. Step 5: Solve for x
    x = 964,815.86/1,425.34
  6. Step 6: Final answer
    x = 676.90

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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.