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Finding the Fourth Proportional to 18,908.80, 28,363.20 and 18,471.40

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Solution

The fourth proportional to 18,908.80, 28,363.20 and 18,471.40 is: 27,707.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,908.80 : 28,363.20 = 18,471.40 : x
  2. Step 2: Convert to fraction form
    18,908.80/28,363.20 = 18,471.40/x
  3. Step 3: Cross multiply
    18,908.80x = 28,363.20 × 18,471.40
  4. Step 4: Simplify right side
    18,908.80x = 523,908,012.48
  5. Step 5: Solve for x
    x = 523,908,012.48/18,908.80
  6. Step 6: Final answer
    x = 27,707.10

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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.