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Finding the Fourth Proportional to 86,570.80, 129,953.40 and 66,936.40

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Solution

The fourth proportional to 86,570.80, 129,953.40 and 66,936.40 is: 100,479.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,570.80 : 129,953.40 = 66,936.40 : x
  2. Step 2: Convert to fraction form
    86,570.80/129,953.40 = 66,936.40/x
  3. Step 3: Cross multiply
    86,570.80x = 129,953.40 × 66,936.40
  4. Step 4: Simplify right side
    86,570.80x = 8,698,612,763.76
  5. Step 5: Solve for x
    x = 8,698,612,763.76/86,570.80
  6. Step 6: Final answer
    x = 100,479.75

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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.