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Finding the Fourth Proportional to 210,699.20, 316,049.09 and 86,040.20

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Solution

The fourth proportional to 210,699.20, 316,049.09 and 86,040.20 is: 129,060.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,699.20 : 316,049.09 = 86,040.20 : x
  2. Step 2: Convert to fraction form
    210,699.20/316,049.09 = 86,040.20/x
  3. Step 3: Cross multiply
    210,699.20x = 316,049.09 × 86,040.20
  4. Step 4: Simplify right side
    210,699.20x = 27,192,924,902.97
  5. Step 5: Solve for x
    x = 27,192,924,902.97/210,699.20
  6. Step 6: Final answer
    x = 129,060.41

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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.