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Finding the Fourth Proportional to 121,318,891.60, 181,978,337.40 and 99,777,816.40

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Solution

The fourth proportional to 121,318,891.60, 181,978,337.40 and 99,777,816.40 is: 149,666,724.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,318,891.60 : 181,978,337.40 = 99,777,816.40 : x
  2. Step 2: Convert to fraction form
    121,318,891.60/181,978,337.40 = 99,777,816.40/x
  3. Step 3: Cross multiply
    121,318,891.60x = 181,978,337.40 × 99,777,816.40
  4. Step 4: Simplify right side
    121,318,891.60x = 18,157,401,137,874,456
  5. Step 5: Solve for x
    x = 18,157,401,137,874,456/121,318,891.60
  6. Step 6: Final answer
    x = 149,666,724.60

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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.