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Finding the Fourth Proportional to 1,272.33, 1,755.75 and 712.83

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Solution

The fourth proportional to 1,272.33, 1,755.75 and 712.83 is: 983.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.33 : 1,755.75 = 712.83 : x
  2. Step 2: Convert to fraction form
    1,272.33/1,755.75 = 712.83/x
  3. Step 3: Cross multiply
    1,272.33x = 1,755.75 × 712.83
  4. Step 4: Simplify right side
    1,272.33x = 1,251,551.27
  5. Step 5: Solve for x
    x = 1,251,551.27/1,272.33
  6. Step 6: Final answer
    x = 983.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.