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Finding the Fourth Proportional to 139,968,351.20, 209,952,526.80 and 128,064,072.80

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Solution

The fourth proportional to 139,968,351.20, 209,952,526.80 and 128,064,072.80 is: 192,096,109.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,351.20 : 209,952,526.80 = 128,064,072.80 : x
  2. Step 2: Convert to fraction form
    139,968,351.20/209,952,526.80 = 128,064,072.80/x
  3. Step 3: Cross multiply
    139,968,351.20x = 209,952,526.80 × 128,064,072.80
  4. Step 4: Simplify right side
    139,968,351.20x = 26,887,375,676,659,152
  5. Step 5: Solve for x
    x = 26,887,375,676,659,152/139,968,351.20
  6. Step 6: Final answer
    x = 192,096,109.20

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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.