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Finding the Fourth Proportional to 289,494,415.20, 434,241,622.80 and 128,251,279.20

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Solution

The fourth proportional to 289,494,415.20, 434,241,622.80 and 128,251,279.20 is: 192,376,918.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,494,415.20 : 434,241,622.80 = 128,251,279.20 : x
  2. Step 2: Convert to fraction form
    289,494,415.20/434,241,622.80 = 128,251,279.20/x
  3. Step 3: Cross multiply
    289,494,415.20x = 434,241,622.80 × 128,251,279.20
  4. Step 4: Simplify right side
    289,494,415.20x = 55,692,043,605,983,888
  5. Step 5: Solve for x
    x = 55,692,043,605,983,888/289,494,415.20
  6. Step 6: Final answer
    x = 192,376,918.80

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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.