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Finding the Fourth Proportional to 661,720.60, 991,924.80 and 324,485.20

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Solution

The fourth proportional to 661,720.60, 991,924.80 and 324,485.20 is: 486,406.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,720.60 : 991,924.80 = 324,485.20 : x
  2. Step 2: Convert to fraction form
    661,720.60/991,924.80 = 324,485.20/x
  3. Step 3: Cross multiply
    661,720.60x = 991,924.80 × 324,485.20
  4. Step 4: Simplify right side
    661,720.60x = 321,864,917,112.96
  5. Step 5: Solve for x
    x = 321,864,917,112.96/661,720.60
  6. Step 6: Final answer
    x = 486,406.07

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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.