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Finding the Fourth Proportional to 257,905.80, 386,858.70 and 253,969.20

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Solution

The fourth proportional to 257,905.80, 386,858.70 and 253,969.20 is: 380,953.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,905.80 : 386,858.70 = 253,969.20 : x
  2. Step 2: Convert to fraction form
    257,905.80/386,858.70 = 253,969.20/x
  3. Step 3: Cross multiply
    257,905.80x = 386,858.70 × 253,969.20
  4. Step 4: Simplify right side
    257,905.80x = 98,250,194,552.04
  5. Step 5: Solve for x
    x = 98,250,194,552.04/257,905.80
  6. Step 6: Final answer
    x = 380,953.80

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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.