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Finding the Fourth Proportional to 720,980.73, 994,959.90 and 398,712.51

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Solution

The fourth proportional to 720,980.73, 994,959.90 and 398,712.51 is: 550,226.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,980.73 : 994,959.90 = 398,712.51 : x
  2. Step 2: Convert to fraction form
    720,980.73/994,959.90 = 398,712.51/x
  3. Step 3: Cross multiply
    720,980.73x = 994,959.90 × 398,712.51
  4. Step 4: Simplify right side
    720,980.73x = 396,702,959,078.35
  5. Step 5: Solve for x
    x = 396,702,959,078.35/720,980.73
  6. Step 6: Final answer
    x = 550,226.85

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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.