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Finding the Fourth Proportional to 391,456,972.80, 587,166,796.80 and 132,646,809.60

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Solution

The fourth proportional to 391,456,972.80, 587,166,796.80 and 132,646,809.60 is: 198,963,890.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,456,972.80 : 587,166,796.80 = 132,646,809.60 : x
  2. Step 2: Convert to fraction form
    391,456,972.80/587,166,796.80 = 132,646,809.60/x
  3. Step 3: Cross multiply
    391,456,972.80x = 587,166,796.80 × 132,646,809.60
  4. Step 4: Simplify right side
    391,456,972.80x = 77,885,802,298,571,472
  5. Step 5: Solve for x
    x = 77,885,802,298,571,472/391,456,972.80
  6. Step 6: Final answer
    x = 198,963,890.57

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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.