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Finding the Fourth Proportional to 20,613.99, 30,881.20 and 12,300.66

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Solution

The fourth proportional to 20,613.99, 30,881.20 and 12,300.66 is: 18,427.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,613.99 : 30,881.20 = 12,300.66 : x
  2. Step 2: Convert to fraction form
    20,613.99/30,881.20 = 12,300.66/x
  3. Step 3: Cross multiply
    20,613.99x = 30,881.20 × 12,300.66
  4. Step 4: Simplify right side
    20,613.99x = 379,859,133.90
  5. Step 5: Solve for x
    x = 379,859,133.90/20,613.99
  6. Step 6: Final answer
    x = 18,427.25

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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.