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Finding the Fourth Proportional to 128,510.77, 177,344.84 and 71,922.14

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Solution

The fourth proportional to 128,510.77, 177,344.84 and 71,922.14 is: 99,252.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,510.77 : 177,344.84 = 71,922.14 : x
  2. Step 2: Convert to fraction form
    128,510.77/177,344.84 = 71,922.14/x
  3. Step 3: Cross multiply
    128,510.77x = 177,344.84 × 71,922.14
  4. Step 4: Simplify right side
    128,510.77x = 12,755,020,494.51
  5. Step 5: Solve for x
    x = 12,755,020,494.51/128,510.77
  6. Step 6: Final answer
    x = 99,252.54

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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.