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Finding the Fourth Proportional to 393,985,773.60, 590,978,660.40 and 212,587,245.60

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Solution

The fourth proportional to 393,985,773.60, 590,978,660.40 and 212,587,245.60 is: 318,880,868.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,985,773.60 : 590,978,660.40 = 212,587,245.60 : x
  2. Step 2: Convert to fraction form
    393,985,773.60/590,978,660.40 = 212,587,245.60/x
  3. Step 3: Cross multiply
    393,985,773.60x = 590,978,660.40 × 212,587,245.60
  4. Step 4: Simplify right side
    393,985,773.60x = 125,634,525,622,813,792
  5. Step 5: Solve for x
    x = 125,634,525,622,813,792/393,985,773.60
  6. Step 6: Final answer
    x = 318,880,868.40

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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.