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Finding the Fourth Proportional to 128,199.51, 176,911.60 and 70,837.92

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Solution

The fourth proportional to 128,199.51, 176,911.60 and 70,837.92 is: 97,754.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,199.51 : 176,911.60 = 70,837.92 : x
  2. Step 2: Convert to fraction form
    128,199.51/176,911.60 = 70,837.92/x
  3. Step 3: Cross multiply
    128,199.51x = 176,911.60 × 70,837.92
  4. Step 4: Simplify right side
    128,199.51x = 12,532,049,590.78
  5. Step 5: Solve for x
    x = 12,532,049,590.78/128,199.51
  6. Step 6: Final answer
    x = 97,754.27

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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.