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Finding the Fourth Proportional to 485,617.80, 728,426.70 and 308,908.20

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Solution

The fourth proportional to 485,617.80, 728,426.70 and 308,908.20 is: 463,362.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,617.80 : 728,426.70 = 308,908.20 : x
  2. Step 2: Convert to fraction form
    485,617.80/728,426.70 = 308,908.20/x
  3. Step 3: Cross multiply
    485,617.80x = 728,426.70 × 308,908.20
  4. Step 4: Simplify right side
    485,617.80x = 225,016,980,728.94
  5. Step 5: Solve for x
    x = 225,016,980,728.94/485,617.80
  6. Step 6: Final answer
    x = 463,362.30

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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.