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Finding the Fourth Proportional to 18,990.81, 28,483.98 and 11,950.05

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Solution

The fourth proportional to 18,990.81, 28,483.98 and 11,950.05 is: 17,923.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.81 : 28,483.98 = 11,950.05 : x
  2. Step 2: Convert to fraction form
    18,990.81/28,483.98 = 11,950.05/x
  3. Step 3: Cross multiply
    18,990.81x = 28,483.98 × 11,950.05
  4. Step 4: Simplify right side
    18,990.81x = 340,384,925.45
  5. Step 5: Solve for x
    x = 340,384,925.45/18,990.81
  6. Step 6: Final answer
    x = 17,923.67

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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.