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Finding the Fourth Proportional to 681,369.60, 940,311.42 and 391,034.28

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Solution

The fourth proportional to 681,369.60, 940,311.42 and 391,034.28 is: 539,639.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,369.60 : 940,311.42 = 391,034.28 : x
  2. Step 2: Convert to fraction form
    681,369.60/940,311.42 = 391,034.28/x
  3. Step 3: Cross multiply
    681,369.60x = 940,311.42 × 391,034.28
  4. Step 4: Simplify right side
    681,369.60x = 367,693,999,095.48
  5. Step 5: Solve for x
    x = 367,693,999,095.48/681,369.60
  6. Step 6: Final answer
    x = 539,639.57

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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.