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Finding the Fourth Proportional to 139,784,460.80, 209,592,710.40 and 71,760,012.80

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Solution

The fourth proportional to 139,784,460.80, 209,592,710.40 and 71,760,012.80 is: 107,596,906.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,784,460.80 : 209,592,710.40 = 71,760,012.80 : x
  2. Step 2: Convert to fraction form
    139,784,460.80/209,592,710.40 = 71,760,012.80/x
  3. Step 3: Cross multiply
    139,784,460.80x = 209,592,710.40 × 71,760,012.80
  4. Step 4: Simplify right side
    139,784,460.80x = 15,040,375,581,090,692
  5. Step 5: Solve for x
    x = 15,040,375,581,090,692/139,784,460.80
  6. Step 6: Final answer
    x = 107,596,906.66

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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.