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Finding the Fourth Proportional to 681,668.40, 940,625.28 and 395,129.28

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Solution

The fourth proportional to 681,668.40, 940,625.28 and 395,129.28 is: 545,233.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,668.40 : 940,625.28 = 395,129.28 : x
  2. Step 2: Convert to fraction form
    681,668.40/940,625.28 = 395,129.28/x
  3. Step 3: Cross multiply
    681,668.40x = 940,625.28 × 395,129.28
  4. Step 4: Simplify right side
    681,668.40x = 371,668,589,636.20
  5. Step 5: Solve for x
    x = 371,668,589,636.20/681,668.40
  6. Step 6: Final answer
    x = 545,233.71

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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.