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Finding the Fourth Proportional to 611,155.90, 917,061.90 and 256,205.80

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Solution

The fourth proportional to 611,155.90, 917,061.90 and 256,205.80 is: 384,446.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,155.90 : 917,061.90 = 256,205.80 : x
  2. Step 2: Convert to fraction form
    611,155.90/917,061.90 = 256,205.80/x
  3. Step 3: Cross multiply
    611,155.90x = 917,061.90 × 256,205.80
  4. Step 4: Simplify right side
    611,155.90x = 234,956,577,739.02
  5. Step 5: Solve for x
    x = 234,956,577,739.02/611,155.90
  6. Step 6: Final answer
    x = 384,446.22

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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.