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Finding the Fourth Proportional to 430,080.80, 645,121.20 and 220,128.80

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Solution

The fourth proportional to 430,080.80, 645,121.20 and 220,128.80 is: 330,193.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    430,080.80 : 645,121.20 = 220,128.80 : x
  2. Step 2: Convert to fraction form
    430,080.80/645,121.20 = 220,128.80/x
  3. Step 3: Cross multiply
    430,080.80x = 645,121.20 × 220,128.80
  4. Step 4: Simplify right side
    430,080.80x = 142,009,755,610.56
  5. Step 5: Solve for x
    x = 142,009,755,610.56/430,080.80
  6. Step 6: Final answer
    x = 330,193.20

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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.