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Finding the Fourth Proportional to 20,609.68, 30,922.68 and 8,931.12

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Solution

The fourth proportional to 20,609.68, 30,922.68 and 8,931.12 is: 13,400.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,609.68 : 30,922.68 = 8,931.12 : x
  2. Step 2: Convert to fraction form
    20,609.68/30,922.68 = 8,931.12/x
  3. Step 3: Cross multiply
    20,609.68x = 30,922.68 × 8,931.12
  4. Step 4: Simplify right side
    20,609.68x = 276,174,165.80
  5. Step 5: Solve for x
    x = 276,174,165.80/20,609.68
  6. Step 6: Final answer
    x = 13,400.22

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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.