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Finding the Fourth Proportional to 18,908.70, 28,363.05 and 13,076.70

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Solution

The fourth proportional to 18,908.70, 28,363.05 and 13,076.70 is: 19,615.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,908.70 : 28,363.05 = 13,076.70 : x
  2. Step 2: Convert to fraction form
    18,908.70/28,363.05 = 13,076.70/x
  3. Step 3: Cross multiply
    18,908.70x = 28,363.05 × 13,076.70
  4. Step 4: Simplify right side
    18,908.70x = 370,895,095.94
  5. Step 5: Solve for x
    x = 370,895,095.94/18,908.70
  6. Step 6: Final answer
    x = 19,615.05

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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.