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Finding the Fourth Proportional to 19,139.25, 28,676.88 and 13,565.64

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Solution

The fourth proportional to 19,139.25, 28,676.88 and 13,565.64 is: 20,325.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,139.25 : 28,676.88 = 13,565.64 : x
  2. Step 2: Convert to fraction form
    19,139.25/28,676.88 = 13,565.64/x
  3. Step 3: Cross multiply
    19,139.25x = 28,676.88 × 13,565.64
  4. Step 4: Simplify right side
    19,139.25x = 389,020,230.40
  5. Step 5: Solve for x
    x = 389,020,230.40/19,139.25
  6. Step 6: Final answer
    x = 20,325.78

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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.