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Finding the Fourth Proportional to 665,055.40, 996,999.90 and 398,921.80

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Solution

The fourth proportional to 665,055.40, 996,999.90 and 398,921.80 is: 598,032.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,055.40 : 996,999.90 = 398,921.80 : x
  2. Step 2: Convert to fraction form
    665,055.40/996,999.90 = 398,921.80/x
  3. Step 3: Cross multiply
    665,055.40x = 996,999.90 × 398,921.80
  4. Step 4: Simplify right side
    665,055.40x = 397,724,994,707.82
  5. Step 5: Solve for x
    x = 397,724,994,707.82/665,055.40
  6. Step 6: Final answer
    x = 598,032.88

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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.