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Finding the Fourth Proportional to 485,221.87, 669,608.83 and 281,393.64

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Solution

The fourth proportional to 485,221.87, 669,608.83 and 281,393.64 is: 388,324.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,221.87 : 669,608.83 = 281,393.64 : x
  2. Step 2: Convert to fraction form
    485,221.87/669,608.83 = 281,393.64/x
  3. Step 3: Cross multiply
    485,221.87x = 669,608.83 × 281,393.64
  4. Step 4: Simplify right side
    485,221.87x = 188,423,666,049.84
  5. Step 5: Solve for x
    x = 188,423,666,049.84/485,221.87
  6. Step 6: Final answer
    x = 388,324.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.