Home / 20,280.84-30,385.08-12,379.20

Finding the Fourth Proportional to 20,280.84, 30,385.08 and 12,379.20

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Solution

The fourth proportional to 20,280.84, 30,385.08 and 12,379.20 is: 18,546.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,280.84 : 30,385.08 = 12,379.20 : x
  2. Step 2: Convert to fraction form
    20,280.84/30,385.08 = 12,379.20/x
  3. Step 3: Cross multiply
    20,280.84x = 30,385.08 × 12,379.20
  4. Step 4: Simplify right side
    20,280.84x = 376,142,982.34
  5. Step 5: Solve for x
    x = 376,142,982.34/20,280.84
  6. Step 6: Final answer
    x = 18,546.72

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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.