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Finding the Fourth Proportional to 7,208,637.39, 9,947,843.81 and 3,900,859.21

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Solution

The fourth proportional to 7,208,637.39, 9,947,843.81 and 3,900,859.21 is: 5,383,144.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,208,637.39 : 9,947,843.81 = 3,900,859.21 : x
  2. Step 2: Convert to fraction form
    7,208,637.39/9,947,843.81 = 3,900,859.21/x
  3. Step 3: Cross multiply
    7,208,637.39x = 9,947,843.81 × 3,900,859.21
  4. Step 4: Simplify right side
    7,208,637.39x = 38,805,138,152,272.95
  5. Step 5: Solve for x
    x = 38,805,138,152,272.95/7,208,637.39
  6. Step 6: Final answer
    x = 5,383,144.70

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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.