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Finding the Fourth Proportional to 20,135.60, 30,235.80 and 15,210.80

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Solution

The fourth proportional to 20,135.60, 30,235.80 and 15,210.80 is: 22,840.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,135.60 : 30,235.80 = 15,210.80 : x
  2. Step 2: Convert to fraction form
    20,135.60/30,235.80 = 15,210.80/x
  3. Step 3: Cross multiply
    20,135.60x = 30,235.80 × 15,210.80
  4. Step 4: Simplify right side
    20,135.60x = 459,910,706.64
  5. Step 5: Solve for x
    x = 459,910,706.64/20,135.60
  6. Step 6: Final answer
    x = 22,840.68

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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.