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Finding the Fourth Proportional to 18,732.80, 28,099.20 and 4,881.80

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Solution

The fourth proportional to 18,732.80, 28,099.20 and 4,881.80 is: 7,322.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,732.80 : 28,099.20 = 4,881.80 : x
  2. Step 2: Convert to fraction form
    18,732.80/28,099.20 = 4,881.80/x
  3. Step 3: Cross multiply
    18,732.80x = 28,099.20 × 4,881.80
  4. Step 4: Simplify right side
    18,732.80x = 137,174,674.56
  5. Step 5: Solve for x
    x = 137,174,674.56/18,732.80
  6. Step 6: Final answer
    x = 7,322.70

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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.