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Finding the Fourth Proportional to 411,580.80, 618,683.40 and 387,961.20

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Solution

The fourth proportional to 411,580.80, 618,683.40 and 387,961.20 is: 583,178.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,580.80 : 618,683.40 = 387,961.20 : x
  2. Step 2: Convert to fraction form
    411,580.80/618,683.40 = 387,961.20/x
  3. Step 3: Cross multiply
    411,580.80x = 618,683.40 × 387,961.20
  4. Step 4: Simplify right side
    411,580.80x = 240,025,154,284.08
  5. Step 5: Solve for x
    x = 240,025,154,284.08/411,580.80
  6. Step 6: Final answer
    x = 583,178.70

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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.