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Finding the Fourth Proportional to 86,279.16, 128,725.70 and 76,806.70

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Solution

The fourth proportional to 86,279.16, 128,725.70 and 76,806.70 is: 114,593.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,279.16 : 128,725.70 = 76,806.70 : x
  2. Step 2: Convert to fraction form
    86,279.16/128,725.70 = 76,806.70/x
  3. Step 3: Cross multiply
    86,279.16x = 128,725.70 × 76,806.70
  4. Step 4: Simplify right side
    86,279.16x = 9,886,996,222.19
  5. Step 5: Solve for x
    x = 9,886,996,222.19/86,279.16
  6. Step 6: Final answer
    x = 114,593.10

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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.