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Finding the Fourth Proportional to 389,785.56, 538,008.06 and 220,119

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Solution

The fourth proportional to 389,785.56, 538,008.06 and 220,119 is: 303,822.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,785.56 : 538,008.06 = 220,119 : x
  2. Step 2: Convert to fraction form
    389,785.56/538,008.06 = 220,119/x
  3. Step 3: Cross multiply
    389,785.56x = 538,008.06 × 220,119
  4. Step 4: Simplify right side
    389,785.56x = 118,425,796,159.14
  5. Step 5: Solve for x
    x = 118,425,796,159.14/389,785.56
  6. Step 6: Final answer
    x = 303,822.94

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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.