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Finding the Fourth Proportional to 18,679.20, 28,018.80 and 9,931.20

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Solution

The fourth proportional to 18,679.20, 28,018.80 and 9,931.20 is: 14,896.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,679.20 : 28,018.80 = 9,931.20 : x
  2. Step 2: Convert to fraction form
    18,679.20/28,018.80 = 9,931.20/x
  3. Step 3: Cross multiply
    18,679.20x = 28,018.80 × 9,931.20
  4. Step 4: Simplify right side
    18,679.20x = 278,260,306.56
  5. Step 5: Solve for x
    x = 278,260,306.56/18,679.20
  6. Step 6: Final answer
    x = 14,896.80

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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.