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Finding the Fourth Proportional to 403,856.80, 605,785.20 and 193,386.40

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Solution

The fourth proportional to 403,856.80, 605,785.20 and 193,386.40 is: 290,079.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,856.80 : 605,785.20 = 193,386.40 : x
  2. Step 2: Convert to fraction form
    403,856.80/605,785.20 = 193,386.40/x
  3. Step 3: Cross multiply
    403,856.80x = 605,785.20 × 193,386.40
  4. Step 4: Simplify right side
    403,856.80x = 117,150,619,001.28
  5. Step 5: Solve for x
    x = 117,150,619,001.28/403,856.80
  6. Step 6: Final answer
    x = 290,079.60

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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.