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Finding the Fourth Proportional to 18,861.75, 28,293.21 and 7,018.47

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Solution

The fourth proportional to 18,861.75, 28,293.21 and 7,018.47 is: 10,527.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,861.75 : 28,293.21 = 7,018.47 : x
  2. Step 2: Convert to fraction form
    18,861.75/28,293.21 = 7,018.47/x
  3. Step 3: Cross multiply
    18,861.75x = 28,293.21 × 7,018.47
  4. Step 4: Simplify right side
    18,861.75x = 198,575,045.59
  5. Step 5: Solve for x
    x = 198,575,045.59/18,861.75
  6. Step 6: Final answer
    x = 10,527.92

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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.