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Finding the Fourth Proportional to 485,769.80, 728,265.90 and 205,056.20

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Solution

The fourth proportional to 485,769.80, 728,265.90 and 205,056.20 is: 307,420.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,769.80 : 728,265.90 = 205,056.20 : x
  2. Step 2: Convert to fraction form
    485,769.80/728,265.90 = 205,056.20/x
  3. Step 3: Cross multiply
    485,769.80x = 728,265.90 × 205,056.20
  4. Step 4: Simplify right side
    485,769.80x = 149,335,438,043.58
  5. Step 5: Solve for x
    x = 149,335,438,043.58/485,769.80
  6. Step 6: Final answer
    x = 307,420.18

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1.5x scale

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.