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Finding the Fourth Proportional to 681,326.08, 940,251.31 and 390,990.76

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Solution

The fourth proportional to 681,326.08, 940,251.31 and 390,990.76 is: 539,579.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,326.08 : 940,251.31 = 390,990.76 : x
  2. Step 2: Convert to fraction form
    681,326.08/940,251.31 = 390,990.76/x
  3. Step 3: Cross multiply
    681,326.08x = 940,251.31 × 390,990.76
  4. Step 4: Simplify right side
    681,326.08x = 367,629,576,248.70
  5. Step 5: Solve for x
    x = 367,629,576,248.70/681,326.08
  6. Step 6: Final answer
    x = 539,579.48

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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.