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Finding the Fourth Proportional to 718,978.32, 992,220.09 and 396,709.29

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Solution

The fourth proportional to 718,978.32, 992,220.09 and 396,709.29 is: 547,475.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,978.32 : 992,220.09 = 396,709.29 : x
  2. Step 2: Convert to fraction form
    718,978.32/992,220.09 = 396,709.29/x
  3. Step 3: Cross multiply
    718,978.32x = 992,220.09 × 396,709.29
  4. Step 4: Simplify right side
    718,978.32x = 393,622,927,427.64
  5. Step 5: Solve for x
    x = 393,622,927,427.64/718,978.32
  6. Step 6: Final answer
    x = 547,475.38

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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.