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Finding the Fourth Proportional to 389,863.40, 538,042.02 and 220,116.20

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Solution

The fourth proportional to 389,863.40, 538,042.02 and 220,116.20 is: 303,777.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,863.40 : 538,042.02 = 220,116.20 : x
  2. Step 2: Convert to fraction form
    389,863.40/538,042.02 = 220,116.20/x
  3. Step 3: Cross multiply
    389,863.40x = 538,042.02 × 220,116.20
  4. Step 4: Simplify right side
    389,863.40x = 118,431,764,882.72
  5. Step 5: Solve for x
    x = 118,431,764,882.72/389,863.40
  6. Step 6: Final answer
    x = 303,777.59

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1.5x scale

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.