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Finding the Fourth Proportional to 398,900.70, 598,221.45 and 132,615.90

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Solution

The fourth proportional to 398,900.70, 598,221.45 and 132,615.90 is: 198,880.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,900.70 : 598,221.45 = 132,615.90 : x
  2. Step 2: Convert to fraction form
    398,900.70/598,221.45 = 132,615.90/x
  3. Step 3: Cross multiply
    398,900.70x = 598,221.45 × 132,615.90
  4. Step 4: Simplify right side
    398,900.70x = 79,333,675,991.06
  5. Step 5: Solve for x
    x = 79,333,675,991.06/398,900.70
  6. Step 6: Final answer
    x = 198,880.76

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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.