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Finding the Fourth Proportional to 68,904,387.51, 103,371,715.16 and 20,378,458.09

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Solution

The fourth proportional to 68,904,387.51, 103,371,715.16 and 20,378,458.09 is: 30,572,162.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,904,387.51 : 103,371,715.16 = 20,378,458.09 : x
  2. Step 2: Convert to fraction form
    68,904,387.51/103,371,715.16 = 20,378,458.09/x
  3. Step 3: Cross multiply
    68,904,387.51x = 103,371,715.16 × 20,378,458.09
  4. Step 4: Simplify right side
    68,904,387.51x = 2,106,556,165,079,477.50
  5. Step 5: Solve for x
    x = 2,106,556,165,079,477.50/68,904,387.51
  6. Step 6: Final answer
    x = 30,572,162.98

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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.