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Finding the Fourth Proportional to 128,417.60, 192,626.40 and 91,019.90

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Solution

The fourth proportional to 128,417.60, 192,626.40 and 91,019.90 is: 136,529.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,417.60 : 192,626.40 = 91,019.90 : x
  2. Step 2: Convert to fraction form
    128,417.60/192,626.40 = 91,019.90/x
  3. Step 3: Cross multiply
    128,417.60x = 192,626.40 × 91,019.90
  4. Step 4: Simplify right side
    128,417.60x = 17,532,835,665.36
  5. Step 5: Solve for x
    x = 17,532,835,665.36/128,417.60
  6. Step 6: Final answer
    x = 136,529.85

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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.