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Finding the Fourth Proportional to 86,053.92, 128,619.52 and 77,601.12

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Solution

The fourth proportional to 86,053.92, 128,619.52 and 77,601.12 is: 115,985.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,053.92 : 128,619.52 = 77,601.12 : x
  2. Step 2: Convert to fraction form
    86,053.92/128,619.52 = 77,601.12/x
  3. Step 3: Cross multiply
    86,053.92x = 128,619.52 × 77,601.12
  4. Step 4: Simplify right side
    86,053.92x = 9,981,018,805.86
  5. Step 5: Solve for x
    x = 9,981,018,805.86/86,053.92
  6. Step 6: Final answer
    x = 115,985.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.