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Finding the Fourth Proportional to 172,461,772.80, 258,692,659.20 and 86,213,491.20

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Solution

The fourth proportional to 172,461,772.80, 258,692,659.20 and 86,213,491.20 is: 129,320,236.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,461,772.80 : 258,692,659.20 = 86,213,491.20 : x
  2. Step 2: Convert to fraction form
    172,461,772.80/258,692,659.20 = 86,213,491.20/x
  3. Step 3: Cross multiply
    172,461,772.80x = 258,692,659.20 × 86,213,491.20
  4. Step 4: Simplify right side
    172,461,772.80x = 22,302,797,297,443,800
  5. Step 5: Solve for x
    x = 22,302,797,297,443,800/172,461,772.80
  6. Step 6: Final answer
    x = 129,320,236.80

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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.