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Finding the Fourth Proportional to 18,978.40, 28,445.98 and 11,865.92

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Solution

The fourth proportional to 18,978.40, 28,445.98 and 11,865.92 is: 17,785.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.40 : 28,445.98 = 11,865.92 : x
  2. Step 2: Convert to fraction form
    18,978.40/28,445.98 = 11,865.92/x
  3. Step 3: Cross multiply
    18,978.40x = 28,445.98 × 11,865.92
  4. Step 4: Simplify right side
    18,978.40x = 337,537,723.00
  5. Step 5: Solve for x
    x = 337,537,723.00/18,978.40
  6. Step 6: Final answer
    x = 17,785.36

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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.