Home / 20,385.12-28,128.96-12,000

Finding the Fourth Proportional to 20,385.12, 28,128.96 and 12,000

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Solution

The fourth proportional to 20,385.12, 28,128.96 and 12,000 is: 16,558.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.12 : 28,128.96 = 12,000 : x
  2. Step 2: Convert to fraction form
    20,385.12/28,128.96 = 12,000/x
  3. Step 3: Cross multiply
    20,385.12x = 28,128.96 × 12,000
  4. Step 4: Simplify right side
    20,385.12x = 337,547,520
  5. Step 5: Solve for x
    x = 337,547,520/20,385.12
  6. Step 6: Final answer
    x = 16,558.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.