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Finding the Fourth Proportional to 13,611.56, 20,412.05 and 5,290.47

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Solution

The fourth proportional to 13,611.56, 20,412.05 and 5,290.47 is: 7,933.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,611.56 : 20,412.05 = 5,290.47 : x
  2. Step 2: Convert to fraction form
    13,611.56/20,412.05 = 5,290.47/x
  3. Step 3: Cross multiply
    13,611.56x = 20,412.05 × 5,290.47
  4. Step 4: Simplify right side
    13,611.56x = 107,989,311.71
  5. Step 5: Solve for x
    x = 107,989,311.71/13,611.56
  6. Step 6: Final answer
    x = 7,933.65

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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.