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Finding the Fourth Proportional to 86,000.80, 128,806.80 and 51,008.80

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Solution

The fourth proportional to 86,000.80, 128,806.80 and 51,008.80 is: 76,397.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,000.80 : 128,806.80 = 51,008.80 : x
  2. Step 2: Convert to fraction form
    86,000.80/128,806.80 = 51,008.80/x
  3. Step 3: Cross multiply
    86,000.80x = 128,806.80 × 51,008.80
  4. Step 4: Simplify right side
    86,000.80x = 6,570,280,299.84
  5. Step 5: Solve for x
    x = 6,570,280,299.84/86,000.80
  6. Step 6: Final answer
    x = 76,397.90

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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.