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Finding the Fourth Proportional to 100,686,796.80, 138,958,446.08 and 61,551,484.80

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Solution

The fourth proportional to 100,686,796.80, 138,958,446.08 and 61,551,484.80 is: 84,947,569.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,686,796.80 : 138,958,446.08 = 61,551,484.80 : x
  2. Step 2: Convert to fraction form
    100,686,796.80/138,958,446.08 = 61,551,484.80/x
  3. Step 3: Cross multiply
    100,686,796.80x = 138,958,446.08 × 61,551,484.80
  4. Step 4: Simplify right side
    100,686,796.80x = 8,553,098,681,724,740
  5. Step 5: Solve for x
    x = 8,553,098,681,724,740/100,686,796.80
  6. Step 6: Final answer
    x = 84,947,569.63

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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.