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Finding the Fourth Proportional to 681,238.48, 940,012.68 and 386,878

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Solution

The fourth proportional to 681,238.48, 940,012.68 and 386,878 is: 533,836.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,238.48 : 940,012.68 = 386,878 : x
  2. Step 2: Convert to fraction form
    681,238.48/940,012.68 = 386,878/x
  3. Step 3: Cross multiply
    681,238.48x = 940,012.68 × 386,878
  4. Step 4: Simplify right side
    681,238.48x = 363,670,225,613.04
  5. Step 5: Solve for x
    x = 363,670,225,613.04/681,238.48
  6. Step 6: Final answer
    x = 533,836.88

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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.