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Finding the Fourth Proportional to 1,425.95, 2,139.16 and 451.83

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Solution

The fourth proportional to 1,425.95, 2,139.16 and 451.83 is: 677.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.95 : 2,139.16 = 451.83 : x
  2. Step 2: Convert to fraction form
    1,425.95/2,139.16 = 451.83/x
  3. Step 3: Cross multiply
    1,425.95x = 2,139.16 × 451.83
  4. Step 4: Simplify right side
    1,425.95x = 966,532.37
  5. Step 5: Solve for x
    x = 966,532.37/1,425.95
  6. Step 6: Final answer
    x = 677.81

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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.