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Finding the Fourth Proportional to 664,851.40, 996,693.90 and 398,717.80

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Solution

The fourth proportional to 664,851.40, 996,693.90 and 398,717.80 is: 597,726.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,851.40 : 996,693.90 = 398,717.80 : x
  2. Step 2: Convert to fraction form
    664,851.40/996,693.90 = 398,717.80/x
  3. Step 3: Cross multiply
    664,851.40x = 996,693.90 × 398,717.80
  4. Step 4: Simplify right side
    664,851.40x = 397,399,599,081.42
  5. Step 5: Solve for x
    x = 397,399,599,081.42/664,851.40
  6. Step 6: Final answer
    x = 597,726.95

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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.