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Finding the Fourth Proportional to 18,708.28, 28,059.91 and 7,615.06

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Solution

The fourth proportional to 18,708.28, 28,059.91 and 7,615.06 is: 11,421.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,708.28 : 28,059.91 = 7,615.06 : x
  2. Step 2: Convert to fraction form
    18,708.28/28,059.91 = 7,615.06/x
  3. Step 3: Cross multiply
    18,708.28x = 28,059.91 × 7,615.06
  4. Step 4: Simplify right side
    18,708.28x = 213,677,898.24
  5. Step 5: Solve for x
    x = 213,677,898.24/18,708.28
  6. Step 6: Final answer
    x = 11,421.57

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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.