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Finding the Fourth Proportional to 210,786.87, 316,180.85 and 86,127.87

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Solution

The fourth proportional to 210,786.87, 316,180.85 and 86,127.87 is: 129,192.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,786.87 : 316,180.85 = 86,127.87 : x
  2. Step 2: Convert to fraction form
    210,786.87/316,180.85 = 86,127.87/x
  3. Step 3: Cross multiply
    210,786.87x = 316,180.85 × 86,127.87
  4. Step 4: Simplify right side
    210,786.87x = 27,231,982,714.65
  5. Step 5: Solve for x
    x = 27,231,982,714.65/210,786.87
  6. Step 6: Final answer
    x = 129,192.03

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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.