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Finding the Fourth Proportional to 704.07, 1,053.77 and 428.81

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Solution

The fourth proportional to 704.07, 1,053.77 and 428.81 is: 641.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.07 : 1,053.77 = 428.81 : x
  2. Step 2: Convert to fraction form
    704.07/1,053.77 = 428.81/x
  3. Step 3: Cross multiply
    704.07x = 1,053.77 × 428.81
  4. Step 4: Simplify right side
    704.07x = 451,859.70
  5. Step 5: Solve for x
    x = 451,859.70/704.07
  6. Step 6: Final answer
    x = 641.78

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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.