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Finding the Fourth Proportional to 321,857.40, 482,786.10 and 172,558.20

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Solution

The fourth proportional to 321,857.40, 482,786.10 and 172,558.20 is: 258,837.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,857.40 : 482,786.10 = 172,558.20 : x
  2. Step 2: Convert to fraction form
    321,857.40/482,786.10 = 172,558.20/x
  3. Step 3: Cross multiply
    321,857.40x = 482,786.10 × 172,558.20
  4. Step 4: Simplify right side
    321,857.40x = 83,308,700,401.02
  5. Step 5: Solve for x
    x = 83,308,700,401.02/321,857.40
  6. Step 6: Final answer
    x = 258,837.30

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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.