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Finding the Fourth Proportional to 665,153.10, 996,417.45 and 398,120.40

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Solution

The fourth proportional to 665,153.10, 996,417.45 and 398,120.40 is: 596,395.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,153.10 : 996,417.45 = 398,120.40 : x
  2. Step 2: Convert to fraction form
    665,153.10/996,417.45 = 398,120.40/x
  3. Step 3: Cross multiply
    665,153.10x = 996,417.45 × 398,120.40
  4. Step 4: Simplify right side
    665,153.10x = 396,694,113,760.98
  5. Step 5: Solve for x
    x = 396,694,113,760.98/665,153.10
  6. Step 6: Final answer
    x = 596,395.20

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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.