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Finding the Fourth Proportional to 1,425.86, 2,139.16 and 451.97

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Solution

The fourth proportional to 1,425.86, 2,139.16 and 451.97 is: 678.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.86 : 2,139.16 = 451.97 : x
  2. Step 2: Convert to fraction form
    1,425.86/2,139.16 = 451.97/x
  3. Step 3: Cross multiply
    1,425.86x = 2,139.16 × 451.97
  4. Step 4: Simplify right side
    1,425.86x = 966,836.15
  5. Step 5: Solve for x
    x = 966,836.15/1,425.86
  6. Step 6: Final answer
    x = 678.07

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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.