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Finding the Fourth Proportional to 128,797.60, 193,196.40 and 86,807.20

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Solution

The fourth proportional to 128,797.60, 193,196.40 and 86,807.20 is: 130,210.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,797.60 : 193,196.40 = 86,807.20 : x
  2. Step 2: Convert to fraction form
    128,797.60/193,196.40 = 86,807.20/x
  3. Step 3: Cross multiply
    128,797.60x = 193,196.40 × 86,807.20
  4. Step 4: Simplify right side
    128,797.60x = 16,770,838,534.08
  5. Step 5: Solve for x
    x = 16,770,838,534.08/128,797.60
  6. Step 6: Final answer
    x = 130,210.80

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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.