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Finding the Fourth Proportional to 389,905.50, 538,071.30 and 211,057.50

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Solution

The fourth proportional to 389,905.50, 538,071.30 and 211,057.50 is: 291,260.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,905.50 : 538,071.30 = 211,057.50 : x
  2. Step 2: Convert to fraction form
    389,905.50/538,071.30 = 211,057.50/x
  3. Step 3: Cross multiply
    389,905.50x = 538,071.30 × 211,057.50
  4. Step 4: Simplify right side
    389,905.50x = 113,563,983,399.75
  5. Step 5: Solve for x
    x = 113,563,983,399.75/389,905.50
  6. Step 6: Final answer
    x = 291,260.28

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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.