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Finding the Fourth Proportional to 20,203.68, 30,312.96 and 8,515.68

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Solution

The fourth proportional to 20,203.68, 30,312.96 and 8,515.68 is: 12,776.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,203.68 : 30,312.96 = 8,515.68 : x
  2. Step 2: Convert to fraction form
    20,203.68/30,312.96 = 8,515.68/x
  3. Step 3: Cross multiply
    20,203.68x = 30,312.96 × 8,515.68
  4. Step 4: Simplify right side
    20,203.68x = 258,135,467.21
  5. Step 5: Solve for x
    x = 258,135,467.21/20,203.68
  6. Step 6: Final answer
    x = 12,776.66

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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.