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Finding the Fourth Proportional to 13,612.60, 20,418.90 and 9,384.40

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Solution

The fourth proportional to 13,612.60, 20,418.90 and 9,384.40 is: 14,076.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,612.60 : 20,418.90 = 9,384.40 : x
  2. Step 2: Convert to fraction form
    13,612.60/20,418.90 = 9,384.40/x
  3. Step 3: Cross multiply
    13,612.60x = 20,418.90 × 9,384.40
  4. Step 4: Simplify right side
    13,612.60x = 191,619,125.16
  5. Step 5: Solve for x
    x = 191,619,125.16/13,612.60
  6. Step 6: Final answer
    x = 14,076.60

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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.