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Finding the Fourth Proportional to 20,355.60, 30,509.10 and 10,489.80

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Solution

The fourth proportional to 20,355.60, 30,509.10 and 10,489.80 is: 15,722.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,355.60 : 30,509.10 = 10,489.80 : x
  2. Step 2: Convert to fraction form
    20,355.60/30,509.10 = 10,489.80/x
  3. Step 3: Cross multiply
    20,355.60x = 30,509.10 × 10,489.80
  4. Step 4: Simplify right side
    20,355.60x = 320,034,357.18
  5. Step 5: Solve for x
    x = 320,034,357.18/20,355.60
  6. Step 6: Final answer
    x = 15,722.18

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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.