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Finding the Fourth Proportional to 661,659,429.60, 992,701,720.80 and 443,556,043.20

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Solution

The fourth proportional to 661,659,429.60, 992,701,720.80 and 443,556,043.20 is: 665,476,569.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,659,429.60 : 992,701,720.80 = 443,556,043.20 : x
  2. Step 2: Convert to fraction form
    661,659,429.60/992,701,720.80 = 443,556,043.20/x
  3. Step 3: Cross multiply
    661,659,429.60x = 992,701,720.80 × 443,556,043.20
  4. Step 4: Simplify right side
    661,659,429.60x = 440,318,847,355,879,104
  5. Step 5: Solve for x
    x = 440,318,847,355,879,104/661,659,429.60
  6. Step 6: Final answer
    x = 665,476,569.45

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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.