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Finding the Fourth Proportional to 391,939.56, 540,866.16 and 222,173.28

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Solution

The fourth proportional to 391,939.56, 540,866.16 and 222,173.28 is: 306,593.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,939.56 : 540,866.16 = 222,173.28 : x
  2. Step 2: Convert to fraction form
    391,939.56/540,866.16 = 222,173.28/x
  3. Step 3: Cross multiply
    391,939.56x = 540,866.16 × 222,173.28
  4. Step 4: Simplify right side
    391,939.56x = 120,166,008,808.21
  5. Step 5: Solve for x
    x = 120,166,008,808.21/391,939.56
  6. Step 6: Final answer
    x = 306,593.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.