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Finding the Fourth Proportional to 681,326.90, 940,252.43 and 390,991.58

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Solution

The fourth proportional to 681,326.90, 940,252.43 and 390,991.58 is: 539,580.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,326.90 : 940,252.43 = 390,991.58 : x
  2. Step 2: Convert to fraction form
    681,326.90/940,252.43 = 390,991.58/x
  3. Step 3: Cross multiply
    681,326.90x = 940,252.43 × 390,991.58
  4. Step 4: Simplify right side
    681,326.90x = 367,630,783,204.54
  5. Step 5: Solve for x
    x = 367,630,783,204.54/681,326.90
  6. Step 6: Final answer
    x = 539,580.61

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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.