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Finding the Fourth Proportional to 86,586.81, 129,899.67 and 30,430.80

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Solution

The fourth proportional to 86,586.81, 129,899.67 and 30,430.80 is: 45,653.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,586.81 : 129,899.67 = 30,430.80 : x
  2. Step 2: Convert to fraction form
    86,586.81/129,899.67 = 30,430.80/x
  3. Step 3: Cross multiply
    86,586.81x = 129,899.67 × 30,430.80
  4. Step 4: Simplify right side
    86,586.81x = 3,952,950,877.84
  5. Step 5: Solve for x
    x = 3,952,950,877.84/86,586.81
  6. Step 6: Final answer
    x = 45,653.04

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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.