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Finding the Fourth Proportional to 12,606.30, 18,909.45 and 11,221.20

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Solution

The fourth proportional to 12,606.30, 18,909.45 and 11,221.20 is: 16,831.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,606.30 : 18,909.45 = 11,221.20 : x
  2. Step 2: Convert to fraction form
    12,606.30/18,909.45 = 11,221.20/x
  3. Step 3: Cross multiply
    12,606.30x = 18,909.45 × 11,221.20
  4. Step 4: Simplify right side
    12,606.30x = 212,186,720.34
  5. Step 5: Solve for x
    x = 212,186,720.34/12,606.30
  6. Step 6: Final answer
    x = 16,831.80

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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.