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Finding the Fourth Proportional to 20,111.60, 30,109.80 and 17,807.60

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Solution

The fourth proportional to 20,111.60, 30,109.80 and 17,807.60 is: 26,660.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,111.60 : 30,109.80 = 17,807.60 : x
  2. Step 2: Convert to fraction form
    20,111.60/30,109.80 = 17,807.60/x
  3. Step 3: Cross multiply
    20,111.60x = 30,109.80 × 17,807.60
  4. Step 4: Simplify right side
    20,111.60x = 536,183,274.48
  5. Step 5: Solve for x
    x = 536,183,274.48/20,111.60
  6. Step 6: Final answer
    x = 26,660.40

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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.