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Finding the Fourth Proportional to 18,765.12, 28,122.84 and 9,981.12

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Solution

The fourth proportional to 18,765.12, 28,122.84 and 9,981.12 is: 14,958.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.12 : 28,122.84 = 9,981.12 : x
  2. Step 2: Convert to fraction form
    18,765.12/28,122.84 = 9,981.12/x
  3. Step 3: Cross multiply
    18,765.12x = 28,122.84 × 9,981.12
  4. Step 4: Simplify right side
    18,765.12x = 280,697,440.78
  5. Step 5: Solve for x
    x = 280,697,440.78/18,765.12
  6. Step 6: Final answer
    x = 14,958.47

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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.