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Finding the Fourth Proportional to 18,981.70, 28,473.30 and 7,134.28

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Solution

The fourth proportional to 18,981.70, 28,473.30 and 7,134.28 is: 10,701.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,981.70 : 28,473.30 = 7,134.28 : x
  2. Step 2: Convert to fraction form
    18,981.70/28,473.30 = 7,134.28/x
  3. Step 3: Cross multiply
    18,981.70x = 28,473.30 × 7,134.28
  4. Step 4: Simplify right side
    18,981.70x = 203,136,316.69
  5. Step 5: Solve for x
    x = 203,136,316.69/18,981.70
  6. Step 6: Final answer
    x = 10,701.70

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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.