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Finding the Fourth Proportional to 71,978,678.80, 99,330,358.46 and 38,938,918.12

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Solution

The fourth proportional to 71,978,678.80, 99,330,358.46 and 38,938,918.12 is: 53,735,588.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,978,678.80 : 99,330,358.46 = 38,938,918.12 : x
  2. Step 2: Convert to fraction form
    71,978,678.80/99,330,358.46 = 38,938,918.12/x
  3. Step 3: Cross multiply
    71,978,678.80x = 99,330,358.46 × 38,938,918.12
  4. Step 4: Simplify right side
    71,978,678.80x = 3,867,816,694,904,189
  5. Step 5: Solve for x
    x = 3,867,816,694,904,189/71,978,678.80
  6. Step 6: Final answer
    x = 53,735,588.92

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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.