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Finding the Fourth Proportional to 86,296.65, 128,751.78 and 76,824.20

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Solution

The fourth proportional to 86,296.65, 128,751.78 and 76,824.20 is: 114,619.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,296.65 : 128,751.78 = 76,824.20 : x
  2. Step 2: Convert to fraction form
    86,296.65/128,751.78 = 76,824.20/x
  3. Step 3: Cross multiply
    86,296.65x = 128,751.78 × 76,824.20
  4. Step 4: Simplify right side
    86,296.65x = 9,891,251,853.32
  5. Step 5: Solve for x
    x = 9,891,251,853.32/86,296.65
  6. Step 6: Final answer
    x = 114,619.19

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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.