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Finding the Fourth Proportional to 20,399.58, 30,611.49 and 11,039.40

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Solution

The fourth proportional to 20,399.58, 30,611.49 and 11,039.40 is: 16,565.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,399.58 : 30,611.49 = 11,039.40 : x
  2. Step 2: Convert to fraction form
    20,399.58/30,611.49 = 11,039.40/x
  3. Step 3: Cross multiply
    20,399.58x = 30,611.49 × 11,039.40
  4. Step 4: Simplify right side
    20,399.58x = 337,932,482.71
  5. Step 5: Solve for x
    x = 337,932,482.71/20,399.58
  6. Step 6: Final answer
    x = 16,565.66

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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.