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Finding the Fourth Proportional to 13,539.40, 20,309.10 and 11,811.40

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Solution

The fourth proportional to 13,539.40, 20,309.10 and 11,811.40 is: 17,717.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,539.40 : 20,309.10 = 11,811.40 : x
  2. Step 2: Convert to fraction form
    13,539.40/20,309.10 = 11,811.40/x
  3. Step 3: Cross multiply
    13,539.40x = 20,309.10 × 11,811.40
  4. Step 4: Simplify right side
    13,539.40x = 239,878,903.74
  5. Step 5: Solve for x
    x = 239,878,903.74/13,539.40
  6. Step 6: Final answer
    x = 17,717.10

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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.