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Finding the Fourth Proportional to 1,425.76, 2,138.87 and 451.79

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Solution

The fourth proportional to 1,425.76, 2,138.87 and 451.79 is: 677.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.76 : 2,138.87 = 451.79 : x
  2. Step 2: Convert to fraction form
    1,425.76/2,138.87 = 451.79/x
  3. Step 3: Cross multiply
    1,425.76x = 2,138.87 × 451.79
  4. Step 4: Simplify right side
    1,425.76x = 966,307.12
  5. Step 5: Solve for x
    x = 966,307.12/1,425.76
  6. Step 6: Final answer
    x = 677.75

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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.