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Finding the Fourth Proportional to 485,221.79, 669,608.72 and 281,393.56

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Solution

The fourth proportional to 485,221.79, 669,608.72 and 281,393.56 is: 388,324.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,221.79 : 669,608.72 = 281,393.56 : x
  2. Step 2: Convert to fraction form
    485,221.79/669,608.72 = 281,393.56/x
  3. Step 3: Cross multiply
    485,221.79x = 669,608.72 × 281,393.56
  4. Step 4: Simplify right side
    485,221.79x = 188,423,578,179.80
  5. Step 5: Solve for x
    x = 188,423,578,179.80/485,221.79
  6. Step 6: Final answer
    x = 388,324.65

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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.