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Finding the Fourth Proportional to 128,087.40, 191,693.70 and 117,589.80

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Solution

The fourth proportional to 128,087.40, 191,693.70 and 117,589.80 is: 175,983.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,087.40 : 191,693.70 = 117,589.80 : x
  2. Step 2: Convert to fraction form
    128,087.40/191,693.70 = 117,589.80/x
  3. Step 3: Cross multiply
    128,087.40x = 191,693.70 × 117,589.80
  4. Step 4: Simplify right side
    128,087.40x = 22,541,223,844.26
  5. Step 5: Solve for x
    x = 22,541,223,844.26/128,087.40
  6. Step 6: Final answer
    x = 175,983.15

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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.