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Finding the Fourth Proportional to 138,978,211.65, 191,789,347.48 and 77,098,550.21

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Solution

The fourth proportional to 138,978,211.65, 191,789,347.48 and 77,098,550.21 is: 106,395,674.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,978,211.65 : 191,789,347.48 = 77,098,550.21 : x
  2. Step 2: Convert to fraction form
    138,978,211.65/191,789,347.48 = 77,098,550.21/x
  3. Step 3: Cross multiply
    138,978,211.65x = 191,789,347.48 × 77,098,550.21
  4. Step 4: Simplify right side
    138,978,211.65x = 14,786,680,636,429,914
  5. Step 5: Solve for x
    x = 14,786,680,636,429,914/138,978,211.65
  6. Step 6: Final answer
    x = 106,395,674.98

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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.