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Finding the Fourth Proportional to 665,042.40, 996,980.40 and 398,908.80

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Solution

The fourth proportional to 665,042.40, 996,980.40 and 398,908.80 is: 598,013.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,042.40 : 996,980.40 = 398,908.80 : x
  2. Step 2: Convert to fraction form
    665,042.40/996,980.40 = 398,908.80/x
  3. Step 3: Cross multiply
    665,042.40x = 996,980.40 × 398,908.80
  4. Step 4: Simplify right side
    665,042.40x = 397,704,254,987.52
  5. Step 5: Solve for x
    x = 397,704,254,987.52/665,042.40
  6. Step 6: Final answer
    x = 598,013.38

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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.