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Finding the Fourth Proportional to 681,478.81, 940,418.70 and 391,138.16

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Solution

The fourth proportional to 681,478.81, 940,418.70 and 391,138.16 is: 539,758.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,478.81 : 940,418.70 = 391,138.16 : x
  2. Step 2: Convert to fraction form
    681,478.81/940,418.70 = 391,138.16/x
  3. Step 3: Cross multiply
    681,478.81x = 940,418.70 × 391,138.16
  4. Step 4: Simplify right side
    681,478.81x = 367,833,639,947.59
  5. Step 5: Solve for x
    x = 367,833,639,947.59/681,478.81
  6. Step 6: Final answer
    x = 539,758.00

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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.