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Finding the Fourth Proportional to 1,279,057,076.94, 1,918,768,632.66 and 393,817,337.40

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Solution

The fourth proportional to 1,279,057,076.94, 1,918,768,632.66 and 393,817,337.40 is: 590,782,356.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279,057,076.94 : 1,918,768,632.66 = 393,817,337.40 : x
  2. Step 2: Convert to fraction form
    1,279,057,076.94/1,918,768,632.66 = 393,817,337.40/x
  3. Step 3: Cross multiply
    1,279,057,076.94x = 1,918,768,632.66 × 393,817,337.40
  4. Step 4: Simplify right side
    1,279,057,076.94x = 755,644,354,000,799,872
  5. Step 5: Solve for x
    x = 755,644,354,000,799,872/1,279,057,076.94
  6. Step 6: Final answer
    x = 590,782,356.49

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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.