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Finding the Fourth Proportional to 718,978.54, 992,193.56 and 396,688.45

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Solution

The fourth proportional to 718,978.54, 992,193.56 and 396,688.45 is: 547,431.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,978.54 : 992,193.56 = 396,688.45 : x
  2. Step 2: Convert to fraction form
    718,978.54/992,193.56 = 396,688.45/x
  3. Step 3: Cross multiply
    718,978.54x = 992,193.56 × 396,688.45
  4. Step 4: Simplify right side
    718,978.54x = 393,591,725,416.38
  5. Step 5: Solve for x
    x = 393,591,725,416.38/718,978.54
  6. Step 6: Final answer
    x = 547,431.81

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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.