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Finding the Fourth Proportional to 86,538.90, 129,866.40 and 30,378.90

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Solution

The fourth proportional to 86,538.90, 129,866.40 and 30,378.90 is: 45,588.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,538.90 : 129,866.40 = 30,378.90 : x
  2. Step 2: Convert to fraction form
    86,538.90/129,866.40 = 30,378.90/x
  3. Step 3: Cross multiply
    86,538.90x = 129,866.40 × 30,378.90
  4. Step 4: Simplify right side
    86,538.90x = 3,945,198,378.96
  5. Step 5: Solve for x
    x = 3,945,198,378.96/86,538.90
  6. Step 6: Final answer
    x = 45,588.73

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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.