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Finding the Fourth Proportional to 18,908.76, 28,369.10 and 8,913.10

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Solution

The fourth proportional to 18,908.76, 28,369.10 and 8,913.10 is: 13,372.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,908.76 : 28,369.10 = 8,913.10 : x
  2. Step 2: Convert to fraction form
    18,908.76/28,369.10 = 8,913.10/x
  3. Step 3: Cross multiply
    18,908.76x = 28,369.10 × 8,913.10
  4. Step 4: Simplify right side
    18,908.76x = 252,856,625.21
  5. Step 5: Solve for x
    x = 252,856,625.21/18,908.76
  6. Step 6: Final answer
    x = 13,372.46

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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.