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Finding the Fourth Proportional to 13,812.20, 20,693.90 and 13,355.40

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Solution

The fourth proportional to 13,812.20, 20,693.90 and 13,355.40 is: 20,009.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,812.20 : 20,693.90 = 13,355.40 : x
  2. Step 2: Convert to fraction form
    13,812.20/20,693.90 = 13,355.40/x
  3. Step 3: Cross multiply
    13,812.20x = 20,693.90 × 13,355.40
  4. Step 4: Simplify right side
    13,812.20x = 276,375,312.06
  5. Step 5: Solve for x
    x = 276,375,312.06/13,812.20
  6. Step 6: Final answer
    x = 20,009.51

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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.