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Finding the Fourth Proportional to 85,986.70, 128,870.70 and 76,582.60

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Solution

The fourth proportional to 85,986.70, 128,870.70 and 76,582.60 is: 114,776.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,986.70 : 128,870.70 = 76,582.60 : x
  2. Step 2: Convert to fraction form
    85,986.70/128,870.70 = 76,582.60/x
  3. Step 3: Cross multiply
    85,986.70x = 128,870.70 × 76,582.60
  4. Step 4: Simplify right side
    85,986.70x = 9,869,253,269.82
  5. Step 5: Solve for x
    x = 9,869,253,269.82/85,986.70
  6. Step 6: Final answer
    x = 114,776.51

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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.