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Finding the Fourth Proportional to 718,912.80, 992,090.28 and 396,636.48

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Solution

The fourth proportional to 718,912.80, 992,090.28 and 396,636.48 is: 547,353.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,912.80 : 992,090.28 = 396,636.48 : x
  2. Step 2: Convert to fraction form
    718,912.80/992,090.28 = 396,636.48/x
  3. Step 3: Cross multiply
    718,912.80x = 992,090.28 × 396,636.48
  4. Step 4: Simplify right side
    718,912.80x = 393,499,196,501.41
  5. Step 5: Solve for x
    x = 393,499,196,501.41/718,912.80
  6. Step 6: Final answer
    x = 547,353.17

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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.