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Finding the Fourth Proportional to 86,585.40, 129,878.10 and 76,962.60

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Solution

The fourth proportional to 86,585.40, 129,878.10 and 76,962.60 is: 115,443.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,585.40 : 129,878.10 = 76,962.60 : x
  2. Step 2: Convert to fraction form
    86,585.40/129,878.10 = 76,962.60/x
  3. Step 3: Cross multiply
    86,585.40x = 129,878.10 × 76,962.60
  4. Step 4: Simplify right side
    86,585.40x = 9,995,756,259.06
  5. Step 5: Solve for x
    x = 9,995,756,259.06/86,585.40
  6. Step 6: Final answer
    x = 115,443.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.