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Finding the Fourth Proportional to 611,919.90, 918,207.90 and 256,969.80

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Solution

The fourth proportional to 611,919.90, 918,207.90 and 256,969.80 is: 385,592.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,919.90 : 918,207.90 = 256,969.80 : x
  2. Step 2: Convert to fraction form
    611,919.90/918,207.90 = 256,969.80/x
  3. Step 3: Cross multiply
    611,919.90x = 918,207.90 × 256,969.80
  4. Step 4: Simplify right side
    611,919.90x = 235,951,700,421.42
  5. Step 5: Solve for x
    x = 235,951,700,421.42/611,919.90
  6. Step 6: Final answer
    x = 385,592.46

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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.