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Finding the Fourth Proportional to 391,954,293.60, 587,931,440.40 and 133,461,391.20

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Solution

The fourth proportional to 391,954,293.60, 587,931,440.40 and 133,461,391.20 is: 200,192,086.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,954,293.60 : 587,931,440.40 = 133,461,391.20 : x
  2. Step 2: Convert to fraction form
    391,954,293.60/587,931,440.40 = 133,461,391.20/x
  3. Step 3: Cross multiply
    391,954,293.60x = 587,931,440.40 × 133,461,391.20
  4. Step 4: Simplify right side
    391,954,293.60x = 78,466,147,966,003,888
  5. Step 5: Solve for x
    x = 78,466,147,966,003,888/391,954,293.60
  6. Step 6: Final answer
    x = 200,192,086.80

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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.