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Finding the Fourth Proportional to 430,420.80, 645,544.80 and 205,780.80

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Solution

The fourth proportional to 430,420.80, 645,544.80 and 205,780.80 is: 308,629.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    430,420.80 : 645,544.80 = 205,780.80 : x
  2. Step 2: Convert to fraction form
    430,420.80/645,544.80 = 205,780.80/x
  3. Step 3: Cross multiply
    430,420.80x = 645,544.80 × 205,780.80
  4. Step 4: Simplify right side
    430,420.80x = 132,840,725,379.84
  5. Step 5: Solve for x
    x = 132,840,725,379.84/430,420.80
  6. Step 6: Final answer
    x = 308,629.89

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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.