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Finding the Fourth Proportional to 721,023, 994,995.27 and 398,735.88

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Solution

The fourth proportional to 721,023, 994,995.27 and 398,735.88 is: 550,246.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,023 : 994,995.27 = 398,735.88 : x
  2. Step 2: Convert to fraction form
    721,023/994,995.27 = 398,735.88/x
  3. Step 3: Cross multiply
    721,023x = 994,995.27 × 398,735.88
  4. Step 4: Simplify right side
    721,023x = 396,740,314,579.29
  5. Step 5: Solve for x
    x = 396,740,314,579.29/721,023
  6. Step 6: Final answer
    x = 550,246.41

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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.