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Finding the Fourth Proportional to 1,425.61, 2,138.45 and 451.72

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Solution

The fourth proportional to 1,425.61, 2,138.45 and 451.72 is: 677.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.61 : 2,138.45 = 451.72 : x
  2. Step 2: Convert to fraction form
    1,425.61/2,138.45 = 451.72/x
  3. Step 3: Cross multiply
    1,425.61x = 2,138.45 × 451.72
  4. Step 4: Simplify right side
    1,425.61x = 965,973.03
  5. Step 5: Solve for x
    x = 965,973.03/1,425.61
  6. Step 6: Final answer
    x = 677.59

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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.