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Finding the Fourth Proportional to 429,592.80, 643,755.60 and 311,512.80

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Solution

The fourth proportional to 429,592.80, 643,755.60 and 311,512.80 is: 466,809.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,592.80 : 643,755.60 = 311,512.80 : x
  2. Step 2: Convert to fraction form
    429,592.80/643,755.60 = 311,512.80/x
  3. Step 3: Cross multiply
    429,592.80x = 643,755.60 × 311,512.80
  4. Step 4: Simplify right side
    429,592.80x = 200,538,109,471.68
  5. Step 5: Solve for x
    x = 200,538,109,471.68/429,592.80
  6. Step 6: Final answer
    x = 466,809.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.