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Finding the Fourth Proportional to 18,728.67, 28,100.70 and 8,865.30

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Solution

The fourth proportional to 18,728.67, 28,100.70 and 8,865.30 is: 13,301.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,728.67 : 28,100.70 = 8,865.30 : x
  2. Step 2: Convert to fraction form
    18,728.67/28,100.70 = 8,865.30/x
  3. Step 3: Cross multiply
    18,728.67x = 28,100.70 × 8,865.30
  4. Step 4: Simplify right side
    18,728.67x = 249,121,135.71
  5. Step 5: Solve for x
    x = 249,121,135.71/18,728.67
  6. Step 6: Final answer
    x = 13,301.59

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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.