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Finding the Fourth Proportional to 611,591.60, 917,387.40 and 256,860.20

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Solution

The fourth proportional to 611,591.60, 917,387.40 and 256,860.20 is: 385,290.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,591.60 : 917,387.40 = 256,860.20 : x
  2. Step 2: Convert to fraction form
    611,591.60/917,387.40 = 256,860.20/x
  3. Step 3: Cross multiply
    611,591.60x = 917,387.40 × 256,860.20
  4. Step 4: Simplify right side
    611,591.60x = 235,640,311,041.48
  5. Step 5: Solve for x
    x = 235,640,311,041.48/611,591.60
  6. Step 6: Final answer
    x = 385,290.30

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Similar ratio
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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.