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Finding the Fourth Proportional to 139,968,165.90, 209,952,248.85 and 128,882,700.30

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Solution

The fourth proportional to 139,968,165.90, 209,952,248.85 and 128,882,700.30 is: 193,324,050.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,165.90 : 209,952,248.85 = 128,882,700.30 : x
  2. Step 2: Convert to fraction form
    139,968,165.90/209,952,248.85 = 128,882,700.30/x
  3. Step 3: Cross multiply
    139,968,165.90x = 209,952,248.85 × 128,882,700.30
  4. Step 4: Simplify right side
    139,968,165.90x = 27,059,212,765,845,568
  5. Step 5: Solve for x
    x = 27,059,212,765,845,568/139,968,165.90
  6. Step 6: Final answer
    x = 193,324,050.45

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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.