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Finding the Fourth Proportional to 139,968,019.70, 209,952,029.55 and 86,145,658.10

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Solution

The fourth proportional to 139,968,019.70, 209,952,029.55 and 86,145,658.10 is: 129,218,487.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,019.70 : 209,952,029.55 = 86,145,658.10 : x
  2. Step 2: Convert to fraction form
    139,968,019.70/209,952,029.55 = 86,145,658.10/x
  3. Step 3: Cross multiply
    139,968,019.70x = 209,952,029.55 × 86,145,658.10
  4. Step 4: Simplify right side
    139,968,019.70x = 18,086,455,755,015,396
  5. Step 5: Solve for x
    x = 18,086,455,755,015,396/139,968,019.70
  6. Step 6: Final answer
    x = 129,218,487.15

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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.