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Finding the Fourth Proportional to 611,289.60, 917,371.80 and 256,558.20

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Solution

The fourth proportional to 611,289.60, 917,371.80 and 256,558.20 is: 385,020.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,289.60 : 917,371.80 = 256,558.20 : x
  2. Step 2: Convert to fraction form
    611,289.60/917,371.80 = 256,558.20/x
  3. Step 3: Cross multiply
    611,289.60x = 917,371.80 × 256,558.20
  4. Step 4: Simplify right side
    611,289.60x = 235,359,257,738.76
  5. Step 5: Solve for x
    x = 235,359,257,738.76/611,289.60
  6. Step 6: Final answer
    x = 385,020.88

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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.