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Finding the Fourth Proportional to 256,598.68, 384,857.60 and 85,819.10

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Solution

The fourth proportional to 256,598.68, 384,857.60 and 85,819.10 is: 128,715.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,598.68 : 384,857.60 = 85,819.10 : x
  2. Step 2: Convert to fraction form
    256,598.68/384,857.60 = 85,819.10/x
  3. Step 3: Cross multiply
    256,598.68x = 384,857.60 × 85,819.10
  4. Step 4: Simplify right side
    256,598.68x = 33,028,132,860.16
  5. Step 5: Solve for x
    x = 33,028,132,860.16/256,598.68
  6. Step 6: Final answer
    x = 128,715.13

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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.