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Finding the Fourth Proportional to 78,806,676.80, 118,210,015.20 and 68,036,139.20

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Solution

The fourth proportional to 78,806,676.80, 118,210,015.20 and 68,036,139.20 is: 102,054,208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,806,676.80 : 118,210,015.20 = 68,036,139.20 : x
  2. Step 2: Convert to fraction form
    78,806,676.80/118,210,015.20 = 68,036,139.20/x
  3. Step 3: Cross multiply
    78,806,676.80x = 118,210,015.20 × 68,036,139.20
  4. Step 4: Simplify right side
    78,806,676.80x = 8,042,553,048,981,316
  5. Step 5: Solve for x
    x = 8,042,553,048,981,316/78,806,676.80
  6. Step 6: Final answer
    x = 102,054,208.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.