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Finding the Fourth Proportional to 409,615.20, 614,509.20 and 129,160.80

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Solution

The fourth proportional to 409,615.20, 614,509.20 and 129,160.80 is: 193,768.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,615.20 : 614,509.20 = 129,160.80 : x
  2. Step 2: Convert to fraction form
    409,615.20/614,509.20 = 129,160.80/x
  3. Step 3: Cross multiply
    409,615.20x = 614,509.20 × 129,160.80
  4. Step 4: Simplify right side
    409,615.20x = 79,370,499,879.36
  5. Step 5: Solve for x
    x = 79,370,499,879.36/409,615.20
  6. Step 6: Final answer
    x = 193,768.44

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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.