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Finding the Fourth Proportional to 12,720, 19,067.04 and 5,328.48

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Solution

The fourth proportional to 12,720, 19,067.04 and 5,328.48 is: 7,987.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720 : 19,067.04 = 5,328.48 : x
  2. Step 2: Convert to fraction form
    12,720/19,067.04 = 5,328.48/x
  3. Step 3: Cross multiply
    12,720x = 19,067.04 × 5,328.48
  4. Step 4: Simplify right side
    12,720x = 101,598,341.30
  5. Step 5: Solve for x
    x = 101,598,341.30/12,720
  6. Step 6: Final answer
    x = 7,987.29

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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.