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Finding the Fourth Proportional to 20,260.60, 30,390.90 and 18,705.40

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Solution

The fourth proportional to 20,260.60, 30,390.90 and 18,705.40 is: 28,058.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,260.60 : 30,390.90 = 18,705.40 : x
  2. Step 2: Convert to fraction form
    20,260.60/30,390.90 = 18,705.40/x
  3. Step 3: Cross multiply
    20,260.60x = 30,390.90 × 18,705.40
  4. Step 4: Simplify right side
    20,260.60x = 568,473,940.86
  5. Step 5: Solve for x
    x = 568,473,940.86/20,260.60
  6. Step 6: Final answer
    x = 28,058.10

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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.