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Finding the Fourth Proportional to 643,285.28, 887,605.68 and 388,650.56

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Solution

The fourth proportional to 643,285.28, 887,605.68 and 388,650.56 is: 536,260.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,285.28 : 887,605.68 = 388,650.56 : x
  2. Step 2: Convert to fraction form
    643,285.28/887,605.68 = 388,650.56/x
  3. Step 3: Cross multiply
    643,285.28x = 887,605.68 × 388,650.56
  4. Step 4: Simplify right side
    643,285.28x = 344,968,444,591.18
  5. Step 5: Solve for x
    x = 344,968,444,591.18/643,285.28
  6. Step 6: Final answer
    x = 536,260.44

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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.