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Finding the Fourth Proportional to 128,908,051.90, 193,078,642.65 and 111,901,939.90

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Solution

The fourth proportional to 128,908,051.90, 193,078,642.65 and 111,901,939.90 is: 167,606,866.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,908,051.90 : 193,078,642.65 = 111,901,939.90 : x
  2. Step 2: Convert to fraction form
    128,908,051.90/193,078,642.65 = 111,901,939.90/x
  3. Step 3: Cross multiply
    128,908,051.90x = 193,078,642.65 × 111,901,939.90
  4. Step 4: Simplify right side
    128,908,051.90x = 21,605,874,665,793,880
  5. Step 5: Solve for x
    x = 21,605,874,665,793,880/128,908,051.90
  6. Step 6: Final answer
    x = 167,606,866.66

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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.