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Finding the Fourth Proportional to 128,908,078.40, 193,078,682.40 and 111,901,966.40

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Solution

The fourth proportional to 128,908,078.40, 193,078,682.40 and 111,901,966.40 is: 167,606,906.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,908,078.40 : 193,078,682.40 = 111,901,966.40 : x
  2. Step 2: Convert to fraction form
    128,908,078.40/193,078,682.40 = 111,901,966.40/x
  3. Step 3: Cross multiply
    128,908,078.40x = 193,078,682.40 × 111,901,966.40
  4. Step 4: Simplify right side
    128,908,078.40x = 21,605,884,230,481,072
  5. Step 5: Solve for x
    x = 21,605,884,230,481,072/128,908,078.40
  6. Step 6: Final answer
    x = 167,606,906.40

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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.