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Finding the Fourth Proportional to 128,384.64, 177,195.32 and 86,017.04

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Solution

The fourth proportional to 128,384.64, 177,195.32 and 86,017.04 is: 118,719.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,384.64 : 177,195.32 = 86,017.04 : x
  2. Step 2: Convert to fraction form
    128,384.64/177,195.32 = 86,017.04/x
  3. Step 3: Cross multiply
    128,384.64x = 177,195.32 × 86,017.04
  4. Step 4: Simplify right side
    128,384.64x = 15,241,816,928.25
  5. Step 5: Solve for x
    x = 15,241,816,928.25/128,384.64
  6. Step 6: Final answer
    x = 118,719.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.