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Finding the Fourth Proportional to 18,946.71, 28,407.92 and 7,861.05

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Solution

The fourth proportional to 18,946.71, 28,407.92 and 7,861.05 is: 11,786.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,946.71 : 28,407.92 = 7,861.05 : x
  2. Step 2: Convert to fraction form
    18,946.71/28,407.92 = 7,861.05/x
  3. Step 3: Cross multiply
    18,946.71x = 28,407.92 × 7,861.05
  4. Step 4: Simplify right side
    18,946.71x = 223,316,040.21
  5. Step 5: Solve for x
    x = 223,316,040.21/18,946.71
  6. Step 6: Final answer
    x = 11,786.53

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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.