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Finding the Fourth Proportional to 18,621.60, 27,964.80 and 13,113.60

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Solution

The fourth proportional to 18,621.60, 27,964.80 and 13,113.60 is: 19,693.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,621.60 : 27,964.80 = 13,113.60 : x
  2. Step 2: Convert to fraction form
    18,621.60/27,964.80 = 13,113.60/x
  3. Step 3: Cross multiply
    18,621.60x = 27,964.80 × 13,113.60
  4. Step 4: Simplify right side
    18,621.60x = 366,719,201.28
  5. Step 5: Solve for x
    x = 366,719,201.28/18,621.60
  6. Step 6: Final answer
    x = 19,693.22

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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.