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Finding the Fourth Proportional to 720,980.96, 994,960.20 and 398,712.88

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Solution

The fourth proportional to 720,980.96, 994,960.20 and 398,712.88 is: 550,227.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,980.96 : 994,960.20 = 398,712.88 : x
  2. Step 2: Convert to fraction form
    720,980.96/994,960.20 = 398,712.88/x
  3. Step 3: Cross multiply
    720,980.96x = 994,960.20 × 398,712.88
  4. Step 4: Simplify right side
    720,980.96x = 396,703,446,827.38
  5. Step 5: Solve for x
    x = 396,703,446,827.38/720,980.96
  6. Step 6: Final answer
    x = 550,227.36

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1.5x scale

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.