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Finding the Fourth Proportional to 871,879.80, 1,308,035.70 and 398,465.40

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Solution

The fourth proportional to 871,879.80, 1,308,035.70 and 398,465.40 is: 597,796.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    871,879.80 : 1,308,035.70 = 398,465.40 : x
  2. Step 2: Convert to fraction form
    871,879.80/1,308,035.70 = 398,465.40/x
  3. Step 3: Cross multiply
    871,879.80x = 1,308,035.70 × 398,465.40
  4. Step 4: Simplify right side
    871,879.80x = 521,206,968,414.78
  5. Step 5: Solve for x
    x = 521,206,968,414.78/871,879.80
  6. Step 6: Final answer
    x = 597,796.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.