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Finding the Fourth Proportional to 643,425.72, 887,928.53 and 356,945.80

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Solution

The fourth proportional to 643,425.72, 887,928.53 and 356,945.80 is: 492,585.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,425.72 : 887,928.53 = 356,945.80 : x
  2. Step 2: Convert to fraction form
    643,425.72/887,928.53 = 356,945.80/x
  3. Step 3: Cross multiply
    643,425.72x = 887,928.53 × 356,945.80
  4. Step 4: Simplify right side
    643,425.72x = 316,942,359,483.67
  5. Step 5: Solve for x
    x = 316,942,359,483.67/643,425.72
  6. Step 6: Final answer
    x = 492,585.78

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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.