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Finding the Fourth Proportional to 485,221.70, 669,608.61 and 281,393.47

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Solution

The fourth proportional to 485,221.70, 669,608.61 and 281,393.47 is: 388,324.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,221.70 : 669,608.61 = 281,393.47 : x
  2. Step 2: Convert to fraction form
    485,221.70/669,608.61 = 281,393.47/x
  3. Step 3: Cross multiply
    485,221.70x = 669,608.61 × 281,393.47
  4. Step 4: Simplify right side
    485,221.70x = 188,423,490,309.78
  5. Step 5: Solve for x
    x = 188,423,490,309.78/485,221.70
  6. Step 6: Final answer
    x = 388,324.53

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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.