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Finding the Fourth Proportional to 485,619.80, 728,429.70 and 308,910.20

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Solution

The fourth proportional to 485,619.80, 728,429.70 and 308,910.20 is: 463,365.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,619.80 : 728,429.70 = 308,910.20 : x
  2. Step 2: Convert to fraction form
    485,619.80/728,429.70 = 308,910.20/x
  3. Step 3: Cross multiply
    485,619.80x = 728,429.70 × 308,910.20
  4. Step 4: Simplify right side
    485,619.80x = 225,019,364,312.94
  5. Step 5: Solve for x
    x = 225,019,364,312.94/485,619.80
  6. Step 6: Final answer
    x = 463,365.30

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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.