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Finding the Fourth Proportional to 485,220.87, 669,607.45 and 281,392.64

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Solution

The fourth proportional to 485,220.87, 669,607.45 and 281,392.64 is: 388,323.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,220.87 : 669,607.45 = 281,392.64 : x
  2. Step 2: Convert to fraction form
    485,220.87/669,607.45 = 281,392.64/x
  3. Step 3: Cross multiply
    485,220.87x = 669,607.45 × 281,392.64
  4. Step 4: Simplify right side
    485,220.87x = 188,422,606,378.39
  5. Step 5: Solve for x
    x = 188,422,606,378.39/485,220.87
  6. Step 6: Final answer
    x = 388,323.38

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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.