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Finding the Fourth Proportional to 18,781.40, 28,139.70 and 12,204.20

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Solution

The fourth proportional to 18,781.40, 28,139.70 and 12,204.20 is: 18,285.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.40 : 28,139.70 = 12,204.20 : x
  2. Step 2: Convert to fraction form
    18,781.40/28,139.70 = 12,204.20/x
  3. Step 3: Cross multiply
    18,781.40x = 28,139.70 × 12,204.20
  4. Step 4: Simplify right side
    18,781.40x = 343,422,526.74
  5. Step 5: Solve for x
    x = 343,422,526.74/18,781.40
  6. Step 6: Final answer
    x = 18,285.25

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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.