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Finding the Fourth Proportional to 389,951.28, 538,128.24 and 220,192.56

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Solution

The fourth proportional to 389,951.28, 538,128.24 and 220,192.56 is: 303,863.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,951.28 : 538,128.24 = 220,192.56 : x
  2. Step 2: Convert to fraction form
    389,951.28/538,128.24 = 220,192.56/x
  3. Step 3: Cross multiply
    389,951.28x = 538,128.24 × 220,192.56
  4. Step 4: Simplify right side
    389,951.28x = 118,491,834,773.89
  5. Step 5: Solve for x
    x = 118,491,834,773.89/389,951.28
  6. Step 6: Final answer
    x = 303,863.18

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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.