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Finding the Fourth Proportional to 430,072.80, 645,109.20 and 220,120.80

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Solution

The fourth proportional to 430,072.80, 645,109.20 and 220,120.80 is: 330,181.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    430,072.80 : 645,109.20 = 220,120.80 : x
  2. Step 2: Convert to fraction form
    430,072.80/645,109.20 = 220,120.80/x
  3. Step 3: Cross multiply
    430,072.80x = 645,109.20 × 220,120.80
  4. Step 4: Simplify right side
    430,072.80x = 142,001,953,191.36
  5. Step 5: Solve for x
    x = 142,001,953,191.36/430,072.80
  6. Step 6: Final answer
    x = 330,181.20

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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.