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Finding the Fourth Proportional to 718,915.86, 992,097.05 and 396,628.56

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Solution

The fourth proportional to 718,915.86, 992,097.05 and 396,628.56 is: 547,343.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,915.86 : 992,097.05 = 396,628.56 : x
  2. Step 2: Convert to fraction form
    718,915.86/992,097.05 = 396,628.56/x
  3. Step 3: Cross multiply
    718,915.86x = 992,097.05 × 396,628.56
  4. Step 4: Simplify right side
    718,915.86x = 393,494,022,338.61
  5. Step 5: Solve for x
    x = 393,494,022,338.61/718,915.86
  6. Step 6: Final answer
    x = 547,343.64

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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.