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Finding the Fourth Proportional to 321,991,874.40, 482,987,811.60 and 287,055,861.60

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Solution

The fourth proportional to 321,991,874.40, 482,987,811.60 and 287,055,861.60 is: 430,583,792.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,991,874.40 : 482,987,811.60 = 287,055,861.60 : x
  2. Step 2: Convert to fraction form
    321,991,874.40/482,987,811.60 = 287,055,861.60/x
  3. Step 3: Cross multiply
    321,991,874.40x = 482,987,811.60 × 287,055,861.60
  4. Step 4: Simplify right side
    321,991,874.40x = 138,644,482,401,136,496
  5. Step 5: Solve for x
    x = 138,644,482,401,136,496/321,991,874.40
  6. Step 6: Final answer
    x = 430,583,792.40

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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.