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Finding the Fourth Proportional to 307,780.80, 460,620.90 and 257,917.20

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Solution

The fourth proportional to 307,780.80, 460,620.90 and 257,917.20 is: 385,995.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    307,780.80 : 460,620.90 = 257,917.20 : x
  2. Step 2: Convert to fraction form
    307,780.80/460,620.90 = 257,917.20/x
  3. Step 3: Cross multiply
    307,780.80x = 460,620.90 × 257,917.20
  4. Step 4: Simplify right side
    307,780.80x = 118,802,052,789.48
  5. Step 5: Solve for x
    x = 118,802,052,789.48/307,780.80
  6. Step 6: Final answer
    x = 385,995.66

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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.