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Finding the Fourth Proportional to 21,730.36, 32,600.52 and 7,879.36

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Solution

The fourth proportional to 21,730.36, 32,600.52 and 7,879.36 is: 11,820.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,730.36 : 32,600.52 = 7,879.36 : x
  2. Step 2: Convert to fraction form
    21,730.36/32,600.52 = 7,879.36/x
  3. Step 3: Cross multiply
    21,730.36x = 32,600.52 × 7,879.36
  4. Step 4: Simplify right side
    21,730.36x = 256,871,233.27
  5. Step 5: Solve for x
    x = 256,871,233.27/21,730.36
  6. Step 6: Final answer
    x = 11,820.85

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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.