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Finding the Fourth Proportional to 393,987,309.60, 590,980,964.40 and 264,992,800.80

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Solution

The fourth proportional to 393,987,309.60, 590,980,964.40 and 264,992,800.80 is: 397,489,201.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,987,309.60 : 590,980,964.40 = 264,992,800.80 : x
  2. Step 2: Convert to fraction form
    393,987,309.60/590,980,964.40 = 264,992,800.80/x
  3. Step 3: Cross multiply
    393,987,309.60x = 590,980,964.40 × 264,992,800.80
  4. Step 4: Simplify right side
    393,987,309.60x = 156,605,700,975,841,088
  5. Step 5: Solve for x
    x = 156,605,700,975,841,088/393,987,309.60
  6. Step 6: Final answer
    x = 397,489,201.20

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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.