Home / 19,821.40-29,732.10-8,128.60

Finding the Fourth Proportional to 19,821.40, 29,732.10 and 8,128.60

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Solution

The fourth proportional to 19,821.40, 29,732.10 and 8,128.60 is: 12,192.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,821.40 : 29,732.10 = 8,128.60 : x
  2. Step 2: Convert to fraction form
    19,821.40/29,732.10 = 8,128.60/x
  3. Step 3: Cross multiply
    19,821.40x = 29,732.10 × 8,128.60
  4. Step 4: Simplify right side
    19,821.40x = 241,680,348.06
  5. Step 5: Solve for x
    x = 241,680,348.06/19,821.40
  6. Step 6: Final answer
    x = 12,192.90

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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.