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Finding the Fourth Proportional to 681,326.12, 940,251.33 and 390,990.80

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Solution

The fourth proportional to 681,326.12, 940,251.33 and 390,990.80 is: 539,579.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,326.12 : 940,251.33 = 390,990.80 : x
  2. Step 2: Convert to fraction form
    681,326.12/940,251.33 = 390,990.80/x
  3. Step 3: Cross multiply
    681,326.12x = 940,251.33 × 390,990.80
  4. Step 4: Simplify right side
    681,326.12x = 367,629,615,016.51
  5. Step 5: Solve for x
    x = 367,629,615,016.51/681,326.12
  6. Step 6: Final answer
    x = 539,579.52

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1.5x scale

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.