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Finding the Fourth Proportional to 665,054.40, 996,998.40 and 398,920.80

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Solution

The fourth proportional to 665,054.40, 996,998.40 and 398,920.80 is: 598,031.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,054.40 : 996,998.40 = 398,920.80 : x
  2. Step 2: Convert to fraction form
    665,054.40/996,998.40 = 398,920.80/x
  3. Step 3: Cross multiply
    665,054.40x = 996,998.40 × 398,920.80
  4. Step 4: Simplify right side
    665,054.40x = 397,723,399,326.72
  5. Step 5: Solve for x
    x = 397,723,399,326.72/665,054.40
  6. Step 6: Final answer
    x = 598,031.38

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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.