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Finding the Fourth Proportional to 18,707.40, 28,061.10 and 8,865.90

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Solution

The fourth proportional to 18,707.40, 28,061.10 and 8,865.90 is: 13,298.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,707.40 : 28,061.10 = 8,865.90 : x
  2. Step 2: Convert to fraction form
    18,707.40/28,061.10 = 8,865.90/x
  3. Step 3: Cross multiply
    18,707.40x = 28,061.10 × 8,865.90
  4. Step 4: Simplify right side
    18,707.40x = 248,786,906.49
  5. Step 5: Solve for x
    x = 248,786,906.49/18,707.40
  6. Step 6: Final answer
    x = 13,298.85

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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.