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Finding the Fourth Proportional to 18,989.94, 28,484.91 and 5,138.94

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Solution

The fourth proportional to 18,989.94, 28,484.91 and 5,138.94 is: 7,708.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.94 : 28,484.91 = 5,138.94 : x
  2. Step 2: Convert to fraction form
    18,989.94/28,484.91 = 5,138.94/x
  3. Step 3: Cross multiply
    18,989.94x = 28,484.91 × 5,138.94
  4. Step 4: Simplify right side
    18,989.94x = 146,382,217.70
  5. Step 5: Solve for x
    x = 146,382,217.70/18,989.94
  6. Step 6: Final answer
    x = 7,708.41

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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.